Monthly Tech-Tip from Tony Hansen SignUp

Use Plainsman Clays? Click here

BORY1 | CELECG | FAAO | FAC5 | FO | G1214M | G1214W | G1214Z1 | G1215U | G1216L | G1216M | G1916Q | G1947U | G2000 | G2240 | G2571A | G2826R | G2826X | g2851H | G2853B | G2896 | G2902B | G2902D | G2916F | G2926B | G2926J | G2926S | G2928C | G2931H | G2931K | G2931L | G2934 | G2934Y | G3806C | G3838A | G3879 | GA10-A | GA10-B | | GA10x-A | GA6-A | GA6-B | GA6-C | GA6-D | GA6-F | GA6-G | GA6-G1 | GA6-H | GBCG | GC106 | GR10-A | GR10-B | GR10-C | GR10-E | GR10-G | GR10-J | GR10-J1 | GR10-K1 | GR10-L | GR6-A | GR6-B | GR6-C | GR6-D | GR6-E | GR6-H | GR6-L | GR6-M | GR6-N | GRNTCG | L2000 | L3341B | L3685U | L3724F | L3924C | L3954B | L3954N | TNF2CG | VESUCG

GA10-D - Alberta Slip Black Cone 10R

Modified: 2017-06-21 13:54:32

You can make a black glaze at cone 10R using only 1% black stain in a 100% calcine:raw mix of Alberta Slip

Material Amount
Alberta Slip50.00
Alberta Slip 1000F Roasted50.00
Added
Mason 6666 or 66001.00
101.00

Notes

Alberta Slip is a great base for black glazes at cone 10 reduction, only 1% black stain is needed to obtain a jet black glossy. Increasing amounts of stain up to 5% move toward a matte black for Mason 6600 (they remain glossy for Mason 6666). Adding 5-10% black stain and 5-7% iron produces a crystalizing intense gunmetal black. Mixtured additions of Mason 6600:6666 (e.g. 1:1, 2:2) produce metallic surfaces.

Like other high-percentage Alberta Slip glazes, you must use a mix of calcined a raw powder. See the preparation page at http://albertaslip.com for more information.

Related Information

Alberta Slip as a base for glossy black glazes at cone 10R


A jet a black glossy glaze for cone 10R is as easy as 1% black stain and 99% Alberta Slip (Mason 6666 or 6600). Of course, the 99% is a mix of calcine and raw material (starting at 50:50).

A metallic, silky crystal black glaze based on Alberta Slip


This is a 50:50 mix of calcine and raw Alberta Slip plus 5 parts Mason 6600 black stain, 5 Mason 6666 black and 7 iron.

Cone 10R Gunmetal black glaze made using Alberta Slip


A 50:50 mix of raw and roasted Alberta Slip with 5% Mason 6666 stain added. The slurry was ball milled. Fired at cone 10R.

Additions of black stain to Alberta Slip at cone 10R


Alberta Slip (50:50 calcine:raw mix) with 1, 2, 3, 4 and 5% added Mason 6666 black stain. Fired at cone 10R. Semi-gloss blacks are produced. Increasing stain percentage above about 3% does not darken the color appreciably.

Roasting Alberta and Ravenscrag Slips at 1000F: Essential for good glazes


Roasted Alberta Slip (right) and raw powder (left). These are thin-walled 5 inch cast bowls, each holds about 1 kg. I hold the kiln at 1000F for 30 minutes. Why do this? Because Alberta Slip is a clay, it shrinks on drying (if used raw the GA6-B and similar recipes will crack as they dry and then crawl during firing). Roasting eliminates that. Calcining to 1850F sinters some particles together (creating a gritty material) while roasting to 1000F produces a smooth, fluffy powder. Technically, Alberta Slip losses 3% of its weight on roasting so I should use 3% less than a recipe calls for. But I often just swap them gram-for-gram.

Links

Firing Schedules Plainsman Cone 10R Firing
Six-step oxidize-at-end schedule to 2372F
Recipes GA10-B - Alberta Slip Tenmoku Cone 10R
You can make a tenmoku from Alberta Slip by adding only 2% iron oxide and 5% calcium carbonate
Typecodes Alberta Slip Glaze Recipes
Alberta Slip is a substitute for Albany Slip that has gained a life of its own so that there are now many glazes based specifically on it.
Materials Alberta Slip
Albany Slip successor - a plastic clay that melts to dark brown glossy at cone 10R, with a frit addition it can also host a wide range of glazes at cone 6.

XML to Paste Into Desktop Insight

<recipes>XML not functional: We are working on this problem.</recipes>
By Tony Hansen
Follow me on

Got a Question?

Buy me a coffee and we can talk

 



https://digitalfire.com, All Rights Reserved
Privacy Policy