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Alberta Slip Black Cone 10R

Code: GA10-D
Modification Date: 2017-06-21 13:54:32
Member of Group: AS10

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

MaterialAmount
Alberta Slip50.049.5%
Alberta Slip Calcined50.049.5%
Additions
Mason 6666 or 66001.01.0%
 101.00  

Firing Schedule

Rate (C)Temp (C)Hold (Min)Step
1012001
5055002
10098003
50130004
01300305
Freefall306

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.

Calcining Alberta Slip

Calcining Alberta Slip

Calcined Alberta Slip (right) and raw powder (left). These are just 5 inch cast bowls, I fire them to cone 020 and hold it for 30 minutes. Why calcine? Because for glazes having 50% or more Alberta Slip, cracking on drying can occur, especially if it is applied thick (Alberta Slip is a clay, it shrinks). I mix 50:50 raw:calcine for use in recipes. However, Alberta Slip has an LOI of 9%, so I need to use 9% less of the calcine powder (just multiply the amount by 0.91). Suppose, I needed 1000 grams: I would use 500 raw and 500*.91=455.

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By Tony Hansen

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