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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
- 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.
GR10-A - Pure Ravenscrag Slip
Modified: 2023-09-19 22:34:46
Ravenscrag all by itself makes a great cone 10 reduction semi-gloss glaze. It also has great working properties.
| Material | Amount |
|---|---|
| Ravenscrag Slip 1000F Roast | 50.00 |
| Ravenscrag Slip | 50.00 |
| 100.00 | |
Notes
Ravenscrag Slip is a revolutionary glaze material for stoneware. At cone 10R it can be used pure and produces a functional semi-gloss surface. The possibilities are endless on what you can do by adding things to this base material. You can make additions to gloss it or matte it more, color and variegate it and/or opacify it. Most will contain 90% Ravenscrag (you can make bamboo, tenmoku, celadon, iron crystal, white, matte, glossy, and much more).
Ravenscrag Slip is a clay, so it shrinks. We recommend starting a 50:50 raw:roast mix in recipes that call for a high percentage of the material (use the roast instructions at http://ravenscrag.com). Adjust the proportion to get the fastest drying possible while still drying hard and having good slurry suspension. Ravenscrag glazes resist settling in the bucket and go on even (when mixed correctly).
Glazes having a high percentage of Ravenscrag Slip are most often prepared using the traditional method of simply adding water until the preferred viscosity is achieved (the material has inherent properties that produce functional slurries for dipping). Control of drying shrinkage and slurry character is achieved by varying the proportion roast and raw powder in the recipe. For us, a weight ratio of 88 water to 100 powder (2200 tap water for 2.5kg of powder) produces a creamy slurry that gives the right thickness on 1-2 second dip on 1850F bisque-ware (with minimal dripping), it has 1.45-1.47-specific-gravity. Using your water you will likely find some variation in this. This recipe actually does not respond to flocculant additions that gel traditional mineral-blend glazes to a thixotropic state.
3000 grams of powder mix makes about 1 Canadian gallon.
Related Information
Sterile white vs. pure Ravenscrag Slip as a liner glaze at cone 10R
This picture has its own page with more detail, click here to see it.
This picture does not fully convey how much better the Ravenscrag is as a liner glaze (vs. G1947U). It has depth and looks much richer. It course, it could be opacified somewhat to be whiter and would still retain the surface quality (as long is it is not too opaque). The body is Plainsman H450. The outside glaze is pure Alberta Slip.
Roast or calcine your Ravenscrag Slip (or other clays) for much better results
This picture has its own page with more detail, click here to see it.
Calcined or roasted clays are indispensable in making many types of glazes, they reduce drying shrinkage (and thus cracking and crawling) compared to those made using raw clay. In a glaze, you can fine-tune a mix of raw and roast clay to achieve a compromise between dry hardness and low shrinkage.
This is Ravenscrag Slip, we roast it to 1000F (roasting is adequate to destroy plasticity and produces a smoother powder than calcining at higher temperatures). To make sure the heat penetrates for this size vessel I hold it for 2 hours at 1000F. Calcined koalin is getting harder to find, this same process can be used to make your own from a raw kaolin powder. One thing is worth noting: Weight lost on firing actually means that less of the roasted powder is needed to yield the same amount of material to the glaze melt, it can be anywhere from 5-12% less.
G1947U transparent glaze (left) vs. Ravenscrag Slip at cone 10R
This picture has its own page with more detail, click here to see it.
Ravenscrag Slip is not ultra glossy but has a silky surface. It also contains some iron oxide and this colors the glaze somewhat. But the surface is much less sterile and pleasant to touch.
100% Ravenscrag slip on Plainsman H550 stoneware fired to cone 10R
This picture has its own page with more detail, click here to see it.
The surface is between silky and glossy.
CaO is a strong flux but it can cause crazing
This picture has its own page with more detail, click here to see it.
2, 5, 10, 15% calcium carbonate added to Ravenscrag Slip on a buff stoneware fired at cone 10R. It gets progressively glossier toward 15%, crazing starts at 10% (test by Kat Valenzuela). Adding a flux only reduces the SiO2 and Al2O3, this pushes the thermal expansion upwards. 5% is actually sufficient. An alternative would be to use wollastonite, it supplies SiO2 also.
How to matte Ravenscrag Slip at cone 10 by adding talc
This picture has its own page with more detail, click here to see it.
2,5,10,15% talc added to Ravenscrag Slip on a buff stoneware fired at cone 10R. Matting begins at 10%. By Kat Valenzuela.
2, 5, 10, 15% dolomite added to Ravenscrag Slip at cone 10R
This picture has its own page with more detail, click here to see it.
This is a buff stoneware clay. Crystal development toward a dolomite matte begins at 15%. By Kat Valenzuela.
2, 5, 10 and 15% alumina hydrate added to Ravenscrag Slip
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Pure Ravenscrag Slip is glaze-like by itself (thus tolerating the alumina addition while still melting as a glaze). It was applied on a buff stoneware which was then fired at cone 10R (by Kat Valenzuela). This same test was done using equal additions of calcined alumina. The results suggest that the hydrated version is decomposing to yield some of its Al2O3, as an oxide, to the glaze melt. By 15% it is matting and producing a silky surface. However crazing also starts at 10%. The more Al2O3 added the lower the glaze expansion should be, so why is this happening? It appears that the disassociation is not complete, raw material remains to impose its high expansion.
Ravenscrag Slip pure: Oxidation vs. Reduction
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Pure Ravenscrag Slip on a porcelain at cone 10 oxidation (left) and cone 10 reduction (right). The reduction fired sample is a very smooth pleasant semi-matte, the other is glossier but dimpled.
Laguna B-Mix, B-Mix+Fireclay with Ravenscrag GR10-A, GR10-C glazes
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Left two mugs are glazed with pure Ravenscrag Slip (roast:raw combo), far right one is RavenTalc silky matte (GR10-C). The speckled mugs have 10% of a Plainsman Fire-Red (a blend of a red fireclay, M2 and a heavily speckled ball clay). Ravenscrag Slip is an ideal base for cone 10R glazes, so many glazes can be made by adding pigments, opacifiers, variegators and matting agents.
B-Mix with Ravenscrag Slip inside and Alberta Slip outside
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Fired cone 10R. The one on the right contains 10% of Plainsman A1:St Rose Red mix to add speckle.
2, 5, 10 and 15% calcined alumina added to Ravenscrag Slip
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The Ravenscag:Alumina mix was applied to a buff stoneware fired at cone 10R (by Kat Valenzuela). Matting begins at only 5% producing a very dry surface by 15%. This "psuedo matte" surface is simply a product of the refractory nature of the alumina as a material, it does not disassociate in the melt to yield its Al2O3 as an oxide (as would a feldspar, frit or clay). The same test using alumina hydrate demonstrates that it disassociates somewhat better (although not completely).
Laguna B-Mix Cone 10R mugs with Alberta and Ravenscrag glazes
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B-Mix is a popular high-ball clay very plastic grey cone 10R stoneware in North America. The two mugs on the left have pure Ravenscrag Slip on the inside (the middle on the outside also), it fires almost transparent with a slightly silky surface. Pure Alberta Slip is employed on the outside of the left one and the inside of the right one. The outside of the right one is RavenTalc silky matte. In all cases the Ravenscrag and Alberta Slip are mixed half-and-half calcined and raw. B-Mix fires dark enough and with enough specks that a normal transparent glaze is not very interesting. But these Ravenscrag ones look much better (for use as a liner glaze).
Links
| URLs |
https://plainsmanclays.com/data/index.php?product=12911
Ravenscrag Data Sheet at Plainsman Clays |
| URLs |
http://ravenscrag.com
Ravenscrag web site |
| Firing Schedules |
Plainsman Cone 10R Firing
Six-step oxidize-at-end schedule to 2372F |
| Typecodes |
Ravenscrag Slip Recipes
Recipes based on Ravenscrag Slip from Plainsman Clays. |
| Typecodes |
High Temperature (Cone 10) Glaze Recipes
Normally reduction gas fired. |
| Recipes |
GR10-C - Ravenscrag Cone 10R Silky Talc Matte
Just Ravenscrag Slip plus 10% talc produces a visually variegated surface that feels silky and looks stunning! |
XML to Paste Into Insight-live
<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Pure Ravenscrag Slip" keywords="Ravenscrag all by itself makes a great cone 10 reduction semi-gloss glaze. It also has great working properties." id="58" date="2023-09-19" codenum="GR10-A"> <recipelines> <recipeline material="Ravenscrag Slip 1000F Roast" amount="50.000"/> <recipeline material="Ravenscrag Slip" amount="50.000"/> <url url="https://digitalfire.com/recipe/58" descrip="https://digitalfire.com/recipe/58"/> </recipelines> <urls/> </recipe> </recipes>
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