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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 Slip*50.00
Alberta Slip 1000F Roasted*50.00
Added
Mason 6666 or 6600*1.00
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.

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

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

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

Cone 10R Gunmetal black glaze made using Alberta Slip

A 50:50 mix of raw and calcined 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

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 Slip at 1000F

Roasting Alberta Slip at 1000F

Roasted Alberta Slip (right) and raw powder (left). These are thin-walled 5 inch cast bowls, each holds about one kg. I hold the kiln at 1000F for 30 minutes. Why do this? Because Alberta Slip is a clay, it shrinks on drying. Roasting eliminates that, a 50:50 raw:roast mix works well for most recipes having high percentages of Alberta Slip. And 1000F? Calcining to 1850F sinters some particles together (creating a gritty material) while 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

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By Tony Hansen


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