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BORY1 - Bory 1 Crystalline Glaze
CELECG - Celestite Crystalline Glaze
FAAO - Fa's All-Opaque Crystalline Glaze
FAC5 - Crystal Number Five Glaze
FO - Octal Crystalline Glaze
G1214M - 20x5 Cone 6 Base Glossy Glaze
G1214W - Cone 6 Transparent Base
G1214Z1 - Cone 6 Silky CaO matte base glaze
G1215U - Low Expansion Glossy Clear Cone 6
G1216L - Transparent for Cone 6 Porcelains
G1216M - Cone 6 Ultraclear Glaze for Porcelains
G1916Q - Low Fire Highly-Expansion-Adjustable Transparent
G1947U - Cone 10 Glossy transparent glaze
G2000 - LA Matte Cone 6 Matte White
G2240 - Cone 10R Classic Spodumene Matte
G2571A - Cone 10 Silky Dolomite Matte glaze
G2826R - Floating Blue Cone 5-6 Original Glaze Recipe
G2826X - Randy's Red Cone 5
g2851H - Ravenscrag Cone 6 High Calcium Matte Blue
G2853B - Cone 04 Clear Ravenscrag School Glaze
G2896 - Ravenscrag Plum Red Cone 6
G2902B - Cone 6 Crystal Glaze
G2902D - Cone 6 Crystalline Development Project
G2916F - Cone 6 Stoneware/Whiteware transparent glaze
G2926B - Cone 6 Whiteware/Porcelain transparent glaze
G2926J - Low Expansion G2926B
G2928C - Ravenscrag Silky Matte for Cone 6
G2931H - Ulexite High Expansion Zero3 Clear Glaze
G2931K - Low Fire Fritted Zero3 Transparent Glaze
G2931L - Low Expansion Low-Fire Clear
G2934 - Matte Glaze Base for Cone 6
G2934Y - Cone 6 Magnesia Matte Low LOI Version
G3806C - Cone 6 Clear Fluid-Melt transparent glaze
G3838A - Low Expansion Transparent for P300 Porcelain
G3879 - Cone 04 Transparent Low-Expansion transparent glaze
GA10-A - Alberta Slip Base Cone 10R
GA10-B - Alberta Slip Tenmoku Cone 10R
GA10-D - Alberta Slip Black Cone 10R
GA10x-A - Alberta Slip Base for cone 10 oxidation
GA6-A - Alberta Slip Cone 6 transparent honey glaze
GA6-B - Alberta Slip Cone 6 transparent honey glaze
GA6-C - Alberta Slip Floating Blue Cone 6
GA6-D - Alberta Slip Glossy Brown Cone 6
GA6-F - Alberta Slip Cone 6 Oatmeal
GA6-G - Alberta Slip Lithium Brown Cone 6
GA6-G1 - Alberta Slip Lithium Brown Cone 6 Low Expansion
GA6-H - Alberta Slip Cone 6 Black
GBCG - Generic Base Crystalline Glaze
GC106 - GC106 Base Crystalline Glaze
GR10-A - Pure Ravenscrag Slip
GR10-B - Ravenscrag Cone 10R Gloss Base
GR10-C - Ravenscrag Cone 10R Silky Talc Matte
GR10-E - Alberta Slip:Ravenscrag Cone 10R Celadon
GR10-G - Ravenscrag Cone 10 Oxidation Variegated White
GR10-J - Ravenscrag Cone 10R Dolomite Matte
GR10-J1 - Ravenscrag Cone 10R Bamboo Matte
GR10-K1 - Ravenscrag Cone 10R Tenmoku
GR10-L - Ravenscrag Iron Crystal
GR6-A - Ravenscrag Cone 6 Clear Glossy Base
GR6-B - Ravenscrag Cone 6 Variegated Light Glossy Blue
GR6-C - Ravenscrag Cone 6 White Glossy
GR6-D - Ravenscrag Cone 6 Glossy Black
GR6-E - Ravenscrag Cone 6 Raspberry Glossy
GR6-H - Ravenscrag Cone 6 Oatmeal Matte
GR6-L - Ravenscrag Cone 6 Transparent Burgundy
GR6-M - Ravenscrag Cone 6 Floating Blue
GR6-N - Ravenscrag Alberta Brilliant Cone 6 Celadon
GRNTCG - GRANITE Crystalline Glaze
L2000 - 25 Porcelain
L3341B - Alberta Slip Iron Crystal Cone 10R
L3685U - Cone 03 White Engobe Recipe
L3724F - Cone 03 Terra Cotta Stoneware
L3924C - Zero3 Porcelain Experimental
L3954B - Cone 6 Engobe (for M340)
L3954N - Cone 10R Base White Engobe Recipe for stonewares
MGBase1 - High Calcium Semimatte 1 (Mastering Glazes)
MGBase2 - High Calcium Semimatte 2 (Mastering Glazes)
MGBase3 - General Purpose Glossy Base 1 (Mastering Glazes)
MGBase4 - Glossy Base 2 Cone 6 (Mastering Glazes)
MGBase5 - Glossy Clear Liner Cone 6 (Mastering Glazes)
MGBase6 - Zinc Semimatte Glossy Base Cone 6
MGBase7 - Raspberry Cone 6 (Mastering Glazes)
MGBase8 - Waxwing Brown Cone 6 (Mastering Glazes)
MGBase9 - Waterfall Brown Cone 6 (Mastering Glazes)
TNF2CG - Tin Foil II Crystalline Glaze
VESUCG - Vesuvius Crystalline Glaze

Insight-Live Shares


77C04E - 50:30:20 Frit 3134 cone 6 base
77E05B - Cone 10R Celadon - Luke Lindoe
77E06B - Lindoe Dark Celadon - Lower COE
77E14A - Cone 10R Red Mustard - Luke Lindoe
77E15A - Cone 10R Yellow Mustard - Luke Lindoe
84-G-05-S - Cone 10R Matte Crystal Iron - Luke Lindoe
G 304 - Cone 10R Crystal Iron Brown - Luke Lindoe
G1002 - LEACH'S CELADON CONE 10R
G1129 - MEDALTA CLEAR GLAZE CONE 8-10
G1214M - Hansen 20x5 Clear Cone 6 Base Glaze
G1214Z - Cone 6 Calcium Matte Base Glaze
G1214Z1 - Cone 6 Calcium Matte v2
G1214Z2 - Cone 6 Calcium Matte + TiO2
G1847 - Cone 10R Robin's Egg Blue
G1916M - COE Adjustable Low Fire Clear Glaze
G1916Q - Cone 05+ Expansion Adjustable Gloss Base
G1916Q2 - G1916Q glaze + 5% silica
G1916Q3 - G1916Q glaze + 10% silica
G1916QL - Cone 05+ Low Expansion Transparent glaze
G1916QL1 - Cone 05+ Lower Expansion glaze
G1916S - Cone 06-04 MgO Matte
G1916S1 - Cone 06-04 MgO (using talc)
G1916V - Cone 2 Clear (based on G1916Q)
G1916W - G1916Q with Iron Fining Agent
G1947U - Cone 10/10R Transparent Base
G2415E - Classic Albany Lithium Brown Glossy
G2415J - G2415E Alberta Slip Brown (less Li)
G2571A - Original Cone 10R Silky Matte Base Recipe
G2571B - Cone 10R Silky Matte Base (improved)
G2571BB - G2571B Rutile Bamboo
G2571C - Cone 10R Silky Matte Blue
G2571D - Cone 10R Silky Matte Red
G2571D1 - Cone 10 Marbled Red Glaze
G2571E - Cone 10R Silky Matte Black
G2576B - Cone 10R Tenmoku Glossy
G2584 - Cone 10R Blue Celadon
G2826A - 50:30:20 Gerstley Borate Cone 6 base
G2826A1 - 50:30:20 Frit 3134 base (fixed)
G2826A2 - 50:30:20 Gillespie Borate Cone 6 base
G2826A3 - 50:30:20 GB Makeover Pottery Glaze
G2826B - GB:Frit Raku Glaze
G2826F - GB Honey Amber 04
G2826G - GB Lavendar Satin Glaze Cone 6
G2826M - Gerstley Borate Antique Green Cone 5
G2826N - Gerstley Borate Raku Base NS/GB
G2826R - Floating Blue Original Cone 6 Glaze
G2826R1 - Floating Blue Using Gillespie Borate
G2826U - Floating Blue using Frit 3134
G2826V - Gerstley Borate Cream Oatmeal Cone 6 recipe
G2850C - Ravenscrag Cone 6 Black Glossy
G2850M-C - Ravenscrag Cone 6 Light Blue Matte
G2850P - TEAL BLUE CONE 6 KAT
G2851A - RAVENSCRAG SLIP Matte Blue - Cone 6
G2851AB - RAVENS FLOATING BLUE Cone 6
G2851D - KAT'S RC MATTE - Cone 6
G2851H - RAVENSCRAG Brown Gold Matte Cone 6
G2880 - Alberta Slip Tenmoku #1
G2880A - Alberta Slip Tenmoku #2
G2881B - Ravenscrag Alberta Slip Celadon
G2890B - Randy's Red Original Cone 6 Glaze
G2894 - Ravenscrag Tenmoku #1
G2894A - Ravenscrag Tenmoku #2
G2908A - Alberta Slip Floating Blue
G2917 - Ravenscrag Floating Blue
G2926 - Perkins Clear
G2926A - Perkins Clear with Frit 3134
G2926B - Cone 6 Clear Glossy Base
G2926BL - G2926B Cone 6 Gloss Black
G2926J - G2926B Reduced COE (Li2O)
G2926S - G2926B Reduced COE (MgO)
G2931 - Worthington Cone 06-2 Clear
G2931F - Zero3 Ulexite Transparent Glaze
G2931G - Zero3 G Low Expansion Low Fire Clear
G2931H - Zero3 H High Expansion Variant
G2931K - Zero3 K Cone 03 Transparent Glaze
G2931L - Zero3 L Low Expansion Variant
G2931L2 - Zero3 L Low Expansion w/F-69
G2932 - Deb's Clear #1 Cone 04-02
G2932A - Deb's Clear #2
G2933 - Gerstley:PV Clay low fire clear
G2934 - Cone 6 Magnesia Matte Base
G2934A - High Dolomite-Testing glaze
G2934BL - G2934 85:15 Adjustable Matte Black
G2934J - G2934 with ZnO for Brown Stains
G2934J1 - G2934 (glossed using ZnO)
G2934Y - G2934 (lower-LOI)
G2934Y1 - G2934Y (Anti-Crawling)
G2934Y2 - G2934Y (Higher COE/Stony)
G2934Y3 - G2934 Super Durable
G2934Y4 - G2934 Super Durable #2
G2934Z - G2934Y Red Using F-69
G2936 - Ravenscrag Low Expansion Cone 6 Base
G2936B - Ravenscrag Low Expansion White Base 2
G2936C - Ravenscrag Original Cone 6 Base Glaze
G2938 - Wright's Water Blue Base
G2941A - Leach's Satin Clear Original
G2941C - Leach's Satin Clear - Craze fix
G3806 - Panama Blue Cone 6
G3806A - Panama Blue 2 - More clay, Copper Oxide
G3806B - Panama Blue 3 - Copper Carbonate
G3806C - Panama Cone 6 Adjustment 2015
G3806D - Panama c6 - Lower COE #1
G3806E - Panama c6 - Lower COE #2
G3806F - Panama c6 - Lower COE #3
G3806K - Panama c6 - Lower COE #7
G3806N - C6 Fluid Clear Final Recipe #10
G3808 - Cone 6 Bright Clear - Shaun Mollonga
G3808A - Cone 6 Bright Clear using Frits
G3813 - Campana Cone 6 Transparent Glaze
G3813B - Campana Clear Lower Expansion #2
G3813C - Campana Clear Low Expansion (no Spodumene)
G3814 - Low Zinc High Feldspar Fritless base
G3822 - Spectrum Clear 700 Dipping Glaze
G3834 - Tenmoku Cone 6
G3840 - Shino Trial Number 1
G3868 - Gold - Cone 6
G3868A - Gold Using Spodumene
G3868B - Gold Using Fusion Frit 493
G3868C - Gold Using Frit #2
G3875 - Tangerine 4 (Orange)
G3875B - Zinc Clear cone 6
G3875C - Tangerine + Orange Stain
G3879 - Cone 04+ UltraClear Glossy Base
G3879C - Cone 04 UltraClear Low-Expansion
G3879E - Cone 04+ UltraClear Glossy Base
G3879F1 - Cone 04+ UltraClear Glossy Base
G3888 - Kieth Davitt High-fluid-melt copper blue
G3892 - Val Cushing Satin White #71
G3903 - Alberta Slip + Frit FZ-16
G3904 - Original Recipe Using Frit 3124
G3904A - 3134 Mistake Recipe Fixed
G3909 - Ravenscrag Cone 10R Matte Blue
G3910 - Fritted version of G1947U #1
G3910A - Fritted version of G1947U #2
G3912A - Surface Tension White Tin
G3914A - Alberta Slip Gloss Black
G3918 - Red Mustard in G2571A Base #1
G3925 - Perfect Clear
G3925B - Perfect Clear Make-Over #1
G3926B - G2926B with Tin/Zircopax
G3926C - G2934 White Tin/Zircopax
G3933 - G2934:G2926B Oatmeal - Cone 6
G3933A - G2934:G2926B Oatmeal Cone 6
G3933E - G3933 Oatmeal Ravenscrag #2
G3933EF - G3933 Oatmeal Ravenscrag #4
G3933G1 - G3933 Oatmeal Alberta Slip + Li
G3939A - Cone 6 Oxidation Marbled Red
G3948 - Red Orange Glazy Original
G3948A - Plainsman Iron Red Orange
G3948A1 - Red Orange - Plainsman Spodumene
G3948A3 - Red Orange - Plainsman Spodumene #2
G3955 - N505 Base Satin White - Opaque
G3966 - Cone 10R S2 - Luke Lindoe
G3971 - Lead Bisilicate Glaze
G3973 - Hilda Ross Rust
G4546 - Pattis Crystal Clear Cone 6
G4594 - 3B as a glaze
GA6-A - Oringal Alberta Slip Amber/Honey base
GA6-F - Alberta Slip Cone 6 Oatmeal
GR10-A - Ravenscrag Cone 10R Transparent Base
GR10-C - Ravenscrag Talc Matte
GR10-CW - Ravenscrag Cone 10R Talc Matte White
GR6-H - Ravenscrag Cone 6 Oatmeal
H0009 - 1945 MEDALTA FILTER CAKE
L2553B - Imco Carbondale Clay - C-Red
L2596E - H550 Casting Body #5
L2596F - H550 Casting Body #6
L2596G - H550 Casting Body #8
L2626 - Barnard Slip
L3127E - Boraq 1
L3127G - Boraq 2
L3127I - Boraq 3
L3127N - Boraq 5 #4 (available materials)
L3146A - Foundry Hill Creme+Nepheline
L3146B - New Foundry Hill Creme
L3146C - FHC + Kyanite
L3146D - FHC + Pyrax
L3164A - Cordierite Flameware - more bentonite, added grog
L3500 - Alberta Slip Original cone 6 base glaze
L3500G - Alberta Slip + Frit 3249
L3500H - Alberta Slip + Frit 3249 and Silica
L3523 - Cone 04 Gerstley Borate matte base
L3523A - Compare Boraq 5 #1 with GB in a glaze
L3523B - L3523 glaze using Boraq 5 L3127L
L3523C - L3523 glaze using Boraq 5 L3127M
L3523D - L3523 recipe using Boraq 5 L3127N
L3617 - Cornwall Stone substitute #2
L3619 - Cornwall Stone Average Analysis
L3660C - Flameware - Very High Pyrax with Molochite
L3660G - Pyrax/Kaolin Flameware
L3660P - Pyrax Flameware (low fire)
L3664A - PV CLAY Feb 2013 Shipment
L3673 - Laguna Barnard Slip Sub
L3685U1 - Zero3 Engobe Recipe
L3685Y - Cone 03 Terrastone 2 Engobe
L3685Z2 - Z2 White Cone 04 Engobe Base (no frit)
L3685Z3 - Z3 White Cone 04 Engobe (5% frit)
L3685Z5 - White Cone 04 Engobe for L4170B (3% frit)
L3685Z6 - Brown Engobe for Snow
L3685Z7 - Cone 04 Brown Engobe for Snow
L3685Z8 - White Cone 2 Engobe for L215, L210, L4170B (2% frit)
L3693E - Alumina Lining for Crucibles
L3693E1 - Zircon Lining for Crucibles
L3693H1 - Plastic Refractory Alumina Body H1
L3724N2 - Zero3 Stoneware
L3728 - Cone 6 Dolomite Testing Glaze
L3778D - Cone 6 Translucent Grolleg Plastic
L3778D1 - Cone 6 Grolleg Pink/Blue Porcelains
L3778G - Cone 6 Translucent Grolleg Casting
L3798C - M340 Casting Body
L3798G - M340C Casting Body Revision 7
L3802E - Crystal Ice - Cone 10
L3806L - Panama c6 - Lower COE #8
L3840 - Diatomaceous Earth (Ant Killer)
L3868 - Craft Crank - From PotClays, UK
L3868A - Craft Crank - Base
L3868C - Craft Crank Clone 2
L3869 - Crank Industrial - From England
L3869A - Industrial Crank Base
L3894D - PV Calc Mix 4
L3906 - P300 Cone 6 Casting Body
L3911 - Bizen Clay
L3916 - Bizen Duplicate using Plainsman Materials
L3924C - Zero3 Porcelain - Experimental
L3924J - Zero4 Plastic Porcelain
L3924L - Zero4 Casting Porcelain
L3954B - Cone 6 White Engobe Recipe
L3954F - Cone 6 Black Engobe
L3954J - Black Cone 10 Whiteware Engobe Recipe
L3954N - Cone 10 Engobe for H550
L3954R - Super-White Engobe for Cone 6
L3954S2 - White Engobe for M340, M390, L215, L210
L3972 - 98 Mix
L3977 - BGP Low Stoneware Body
L4001 - Plainsman Super Kiln Wash
L4005D - M390 Casting Version 5
L4023F - Proposed H440 Casting Body #5
L4028 - G2571A Rutile Bamboo
L4053B - Cone 6 Black Clay Body - Type 1
L4068 - Barnard Chemical Substitute
L4115J3 - L211 Stnwre 3D:OM4:NS
L4115L2 - L211 3D:OM4:NS:Talc 42 mesh
L4115L2a - L211 3D:OM4:NS:Talc 80 mesh
L4158 - Cimtalc 15 Talc lab test
L4159 - Cimtuff 9115 Talc lab test
L4163 - Red Art Cone 1 Clay Body
L4168G5 - H440C (concentrate) #5
L4168G9 - New H440 Functional Proposal #8
L4170 - L215 Terra Cotta Casting #1
L4170B - Terra Cotta Casting #2
L4170F - Terra Cotta Casting #3
L4208C - MNS Cone 6 Fine Stoneware
L4208D - 3B +200# particles sieved out
L4217G - M370-like Cone 6 Faster Casting
L4227 - Plus Clay
L4228 - Fimo Clay
L4239 - H550 Casting Body #7
L4244 - BGP Clay:Flyash F 50:50 Mix
L4244A - Flyash F:Bentonite 10:90
L4245 - LaFarge Fly Ash F:Bentonite 95:5 Mix
L4245F - Fly Ash F:Bentonite:BallClay 80:10:10
L4246 - A2 +200# particles sieved out
L4247 - A3 +200# particles sieved out
L4248 - Old Hickory M23 Ball Clay
L4249 - 3D +200# particles sieved out
L4249A - 3D MNS 325 Mesh
L4249B - 3D 100 mesh
L4264 - Raku Crackle Glaze Base - Frit 3110
L4264A - Raku Glaze Base #1
L4264B - Raku Glaze Base #2
L4264C - Raku Glaze Base #3
L4264D - Raku Glaze Base #4
L4273 - G3806N1 + 2% Zircopax
L4280 - L215 : M390 Mix for Cone 1 Stoneware
L4287 - Midfield Clay Yukon
L4287A - Catchment Clay Yukon
L4292 - Monte Marte Air Hardening Clay
L4293 - DAS Air Drying Clay
L4294 - Sculpey PE08 Oven Bake Clay
L4398 - Ravenscrag Cone 6 Raspberry
L4404A - Refractory Casting Slip
L4404B - Plastic Refractory (heavy duty)
L4404C - Refractory Plastic (low expansion)
L4404D - Refractory Casting (low expansion)
L4410L - L213 NS:Dolo 30:20
L4410P - L213 40:10 Dolo/NS
L4421 - Seed pelleting clay and binder
L4441A - Minspar
L4441B - Minspar Calculated Substitute
L4453C - 3D:A2 Body Base H550 Blend
L4458 - Lithium Flameware Test
L4482B - Alumina Wadding #2
L4484D - 2018 3B+6% 6666 at 100#
L4498 - Low Expansion Super White Cone 6 Fritware
L4498A - Low Expansion Fritware Casting
L4530 - Carbondale M390 #1
L4530A - Carbondale M390 #2
L4532A - Pyrometric cone pressing body #2
L4532B - Cone pressing body #3
L4532D - Cone pressing body #5
L4532F - Cone 5 Cone-casting v.1
L4543 - Firebrick & kiln post/shelf clay - v1.0
L4543B - Firebrick & kiln post clay v2.0
L4543C - Refractory kiln post clay v4.0
L4557 - Volumetric Screw Feeder Design - ESP32 based
L4558 - M390 Casting (M370+C-Red)
L4558A - M390 Cone 6 C-Red Casting #1
L4558B - M390 Cone 6 C-Red Casting #2
L4567 - Cat Litter
L4575 - SIAL Refractory Slip
L4575A - SIAL refractory slip Duplicate
L4588 - Red NZK Cone 6 Porcelain
L4597 - Luke Lindoe Fired Samples
L4599 - Slip for Slipware
L4599A - Slip for Slipware - #5 Ball Clay
L4608 - Kyanite Bisque-Fix, Kiln-Patch
L4655 - Titanium Dioxide in GA6-C
L4655A - GA6-C Titanium + Iron
L4655B - GA6-C Lower Thermal Expansion
L4696 - Cordierite Flameware
L4697 - Flameware body from French mfgr
L4705A - GA6-C Using Frit 3195 and Titanium
L4768D - Cone 6 Black Casting Body - Type 2
L4768E - Cone 6 Black Casting Body - Type 3.1
L4768H - Cone 6 Black Casting Body - Type 3.3
L4807 - M370-like Super-Fast Casting Porcelain
MHSCUL - MASTER RedArt Sculpture Clay
MRG6B - G2850A Ravenscrag Cone 6 Light Blue
MRG6C - Ravenscrag Cone 6 White Glossy
MRG6E - G2850P Ravenscrag Cone 6 Raspberry
MRG6G - G2851H Ravenscrag Cone 6 Light Blue Matte
P4738A - 98 BGP RETEST
P4808 - 45D
P5867 - Sculpture Clay
P6385 - M2 ST
P6821 - L215 Production Run - Mar 2020
P7088 - H440
PC-32 - Amaco Glaze: PC-32 Albany Brown

Insight-Live Shares (also referencing this recipe)

These add technical detail, development info, variations and improvements.

G2931K - Zero3 K Cone 03 Transparent Glaze

Modified: 2023-05-03 20:54:14

A cone 03-02 clear medium-expansio glaze developed from Worthington Clear.

Material Amount Percent
Ferro Frit 319525.0026.3
Ferro Frit 313433.0034.7
EPK20.0021.1
Ferro Frit 324910.0010.5
Ferro Frit 31107.007.4
95.00 100

Notes

This recipe improved on the popular Worthington Gerstley-Borate-based low fire clear recipe. It targeted cone 03 to work best on Zero3 stoneware and porcelain. To fire lower (cone 06-04), consider G1916Q (or derivatives) instead.

Unlike its Worthington Clear predecessor, this does not become a bucket of jelly, does not crack on drying, does not go on unevenly or the wrong thickness, does not cloud up with boron blue or micro-bubbles when fired (because it has lower CaO) when used on the types of bodies discussed below. It is crystal clear and super glassy at cone 03.

If you liked the variegated appearance of the GB version, titanium dioxide can be added to this to produce even better variegation. For darker color rutile with do the same.

Low fire bodies span a wide range of thermal expansions. While Worthington clear (an ancestor of this recipe) melts to a good clear, its thermal expansion was too low. This recipe, G2931K, raises thermal expansion (by adding Na2O). The thermal expansion of Zero3 stoneware and porcelain are about the middle of the range, and they develop good glaze:glaze interfaces, so this recipe fits them well.

This glaze shivers on high-talc bodies and can craze on zero-talc porous ones. This recipe has three variations we have worked with, one of higher expansion (G2931H) and one of lower expansion (G2931L). Keep in mind that adding zircon and stains changes expansion.

Dipping ware in Zero3 Transparent is just so much easier than trying to paint on commercial, slow-drying clears. For us it naturally gels to a creamy consistency at around 1.53 specific gravity (in our circumstances). However it goes on too thick at that high a value, we have found the best all-around performance at 1.43 with enough Epsom Salts to gel it back up to a creamy thixotropic consistency (a few grams per gallon).

Pay special attention to the drop-and-hold firing schedule, especially if your clay body is not fine-grained. Use 04DSDH as a model.

To mix up 5 Kg use about 4.5 kg of water to get 6.5 litres of dipping glaze. To make a brushing glaze: For each 100g of powder mix start with 125 water, 1.5 CMC gum and 1.5 Veegum and thoroughly mix in a kitchen blender (add water if it gels too much). We find the about 330g of powder produces a 500ml (about 1 pint) jar.

To make colored versions add stains as needed (if stains cause micro-bubbling or orange peel surface include 2-3% zircopax).

Related Information

G2931K Zero3 transparent glaze on Zero3 Fritware Porcelain


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This is an all-fritted version of G2931F Zero3 transparent glaze. I formulated this glaze by calculating what mix of frits must be employed to supply the same chemistry of the G2931F recipe. The mug is made from the Zero3 porcelain body (fired at cone 03) with this glaze. This glaze fits both the porcelain and the Zero3 terra cotta stoneware. The clarity, gloss, fit and durability of this glaze are outstanding.

Firing a porcelain in less than 4 hours total


This picture has its own page with more detail, click here to see it.

This porcelain mug put into kiln at 8:45am and I was drinking coffee from it at 12:15! How? One way to fast-fire is to fire a lot lower. This is Zero3 porcelain made using Dragonite Halloysite (not quite as white-burning as New Zealand Halloysite). It is the L2934C recipe. It was fired to cone 03 and glazed with G2931K clear glaze (which has fired crystal clear and flawless). I fired at 1200F/hr to 1950F, held it for 15 minutes, cooled at 999F/hr to 1850F and held it for 30 minutes, then dropped as fast as the kiln would do. Is this really porcelain? Yes. And it is super strong. The frit in the recipe is magic, making it vitrify quickly and completely.

Cone 10R porcelain (left) vs cone 03 porcelain (right)


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Want to make this incredible porcelain and glaze yourself? Read on. The mug on the left is a cone 10R (2350F/1290C) porcelain (#6 Tile kaolin and Nepheline Syenite) with G1947U clear glaze. The other is a fritted cone 03 (1950F or 1065C) porcelain (NZ Kaolin, Ferro Frit 3110) with G2931K clear glaze. We call the body/glaze/firing system "Zero3" (google it or use the links here). The Zero3 porcelain is blue-white instead of grey, the glaze is crystal clear, underglaze colors are so much more vibrant. This Zero3 mug was fired in 3 hours (cold-to-cold). It fits glazes really well, it is very strong and much more translucent. How is this possible? The magic of the frit, it melts so much better than nepheline. It is the most expensive body you will ever make. But from it you may create the highest quality ware you have ever made using the most plastic body you have ever thrown! Follow the instructions carefully.

One way for an ultra clear at low fire: Magnesia-alkali, low Si:Al ratio, more boron.


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On the left is G2931J, a zinc alkali fluxed and high Si:Al ratio glaze. Those look like micro-bubbles but they are much more likely to be micro-crystals (high-zinc and high-silica is the mechanism for crystalline glazes). G2931K on the right has much more boron, double the Al2O3, less SiO2 and is magnesia-alkali instead of zinc-alkali. It is the product of dozens of tests to find an ultra-clear having a glassy smooth surface. This particular chemistry, although having only a 6:1 SiO2:Al2O3 ratio is ultra-gloss. In addition, is has low expansion, will fast fire and the boron is not high enough to compromise the hardness.

What happens if Zero3 Clear is applied too thick


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It runs downward during firing and the thicker sections have micro-bubbles that clouds the otherwise crystal-clear glass.

G2931K Transparent cone 03 with 15% inclusion stains


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On Zero3 porcelain. Between 10 and 15% stain with 2-3% Zirocpax (zircon) added (to prevent bubbling). The firing schedule approached cone 03 (1950F) at 100F/hr for the final 100 degrees, held for 5 minutes, dropped to 1800 and held for 30 minutes.

The varying power of different encapsulated stains


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These mugs are fired at cone 03. The outside glazes are G2931K transparent with added stain plus 3% Zircopax. The left one contains 10% Mason 6021 red. The right one has 15% Cerdec 297497 red stain. The latter is an older product, obviously not as potent. Encapsulated stains are a revolution in ceramics but test the ones available. You could save money and get better color at the same time.

Dip-glazing vs. brush-on glazing: Which gives the more even surface?


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This is a clear glaze (G2931K) with 10% purple stain (Mason 6385). The mugs are cone 03 porcelain (Zero3). The mug on the left was dipped (at the bisque stage) into a slurry of the glaze (having an appropriate specific gravity and thixotropy). The glaze dried in seconds. The one on the right was painted on (two layers). Like any paint-on glaze, it contains gum (1% CMC). Each layer required several minutes of application time and fifteen minutes of drying time. Yet it is still not evenly applied.

Three low fire bodies need three different clear glazes. Why?


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Glaze fit. The left-most clay mug contains no talc (Plainsman Buffstone), the centre one about 25% talc (L212) and the right one is about 45% talc (L213). Talc raises thermal expansion. The centre glaze is G2931K, it is middle-of-the-road thermal expansion (Insight-live reports it as 7.4) and fits the low-talc bodies (and Zero3 porcelain and stoneware). But it crazes on Buffstone and shivers on L213. The lesson is: Forget about expecting one clear or base glaze to fit all low fire bodies. But there is a solution. I adjusted it to reduce its expansion to work on zero-talc porous bodies and raise it to work on high talc bodies. How? By decreasing and increasing the KNaO (in relation to other fluxes). The three fire crystal clear and work the best in a drop-and-hold firing.

Underglazes, engobe, a good transparent glaze and cone 03. Life is good!


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The white engobe was applied by pouring at leather hard stage. The underglazes were also painted on at leather hard. The mugs were then dried, cleaned, bisque fired, dipping in clear glaze and final fired to cone 03. The clay and engobe have frit additions to make them vitrify at low temperatures.

Low fire heaven: Use commercial underglazes but make your own clear over glaze


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Decorate ware with the underglazes at the leather hard stage, dry and bisque fire it and then dip-glaze in a transparent that you make yourself (and thus control). These mugs are fired at cone 03. All have the same transparent glaze (G2931K), all were decorated with the same underglazes. Notice how bright the colors are compared to middle or high temperature. On the left is a porous talc/stoneware blend (Plainsman L212), rear is a fritted Zero3 stoneware and right is Zero3 fritted porcelain. When mixed properly you can dip ware in this glaze and it covers evenly, does not drip and dries enough to handle in seconds! Follow the Zero3 firing schedule and you will have ware of amazing quality.

Why would a low fire transparent require four frits?


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To get the needed chemistry to avoid boron blue clouding (calcium borate crystals). The one on the right clouds, the other does not. Why? Differences in the chemistry (as seen in my account at insight-live.com). G2931K, on the left, has greater Al2O3 (which impedes the growth of crystals), lower CaO (starves their growth) and more boron (for better melting). There is actually no practical way to adjust the recipe on the right (by supplying MgO with talc and fiddling with frit percentages) to achieve this. Frit 3124 lacks Na2O and B2O3. 3134 has excessive CaO and almost zero Al2O3. Talc does not melt well enough. But Frit 3249 supplies the needed MgO and has lots of B2O3 and low CaO. And Frit 3110 has low CaO and supplies the needed Na2O.

When it makes sense to fire hotter than cone 04


Two mugs, the one fired at cone 03 is better.

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The body is Plainsman L215 (bisque fired at cone 06). These commercial underglazes are not temperature-specific, they work the same across a wide range of temperatures. But the glaze is G2931K, it was designed for cone 03 and does not melt as well at cone 04 (for example, it goes milky if applied too thick), it was for use on Zero3 stoneware and Zero3 porcelain. This body is, however, a standard porous earthenware. While it is normally fired at cone 06-04, it tolerates cone 03. Actually, it benefits from cone 03, firing stronger and a deeper red color. So, since this glaze and body are both better at cone 03, it makes total sense to fire pieces like that at that temperature.

Terra cotta transparent glaze: Too thick and just right


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When clear-glazing terra cotta ware (Plainsman L215 here) an important issue is glaze thickness. The mug on the left was double-dipped (so suspended bubbles are present in the handle recess, thumb-hold and along its edges). The glaze needs to be thick enough so that it feels glassy smooth but thin enough to avoid the bubbles. Normally, if applied the thickness of the one on the left, it would be completely milky, filled with micro-bubble clouds. Why has it not done so here? Because it is fired at cone 03 (using G2931K glaze and the C03DRH firing schedule). An added benefit is that the body is so much stronger than it would be if fired at cone 06 or 04. And the underglazes work fine.

Links

Recipes G2931H - Ulexite High Expansion Zero3 Clear Glaze
A cone 03-02 higher expansion fritted clear glaze developed from Worthington Clear.
Recipes L3924C - Zero3 Porcelain Experimental
Recipes G2931L - Low Expansion Low-Fire Clear
A cone 03-02 low expansion clear ceramic glaze developed from Worthington Clear.
Recipes G1916Q - Low Fire Highly-Expansion-Adjustable Transparent
An expansion-adjustable cone 04 transparent glaze made using three common Ferro frits (low and high expansion), it produces an easy-to-use slurry.
Glossary Transparent Glazes
Every glossy ceramic glaze is actually a base transparent with added opacifiers and colorants. So understand how to make a good transparent, then build other glazes on it.
Glossary Zero3
The designation for a group recipes for body, glaze and engobe (by Tony Hansen), that potters can use to make low fire stoneware and fritware porcelain at 1100C (2000F) or cone 03.
Articles Where do I start in understanding glazes?
Break your addiction to online recipes that don't work or bottled expensive glazes that you could DIY. Learn why glazes fire as they do. Why each material is used. How to create perfect dipping and brushing properties. Even some chemistry.
Articles Concentrate on One Good Glaze
It is better to understand and have control of one good base glaze than be at the mercy of dozens of imported recipes that do not work. There is a lot more to being a good glaze than fired appearance.
Articles The Majolica Earthenware Process
How to make strong, durable functional ware from red terra cotta odies based on the traditional of majolica.
URLs https://insight-live.com/insight/share.php?z=8JFvDgDc3X
Plainsman Zero3 Glaze L,K,H and Firing Schedule
URLs https://insight-live.com/insight/share.php?z=5R9GFgEEYF
Zero3 porcelain/stoneware, engobe, clear glaze and firing schedule

XML to Paste Into Insight-live

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<recipeline material="Ferro Frit 3195" amount="25.000"/>
<recipeline material="Ferro Frit 3134" amount="33.000"/>
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<recipeline material="Ferro Frit 3249" amount="10.000"/>
<recipeline material="Ferro Frit 3110" amount="7.000"/>
<url url="https://digitalfire.com/recipe/132" descrip="https://digitalfire.com/recipe/132"/>
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By Tony Hansen
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