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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
| Material | Amount | |||
| Alberta Slip | 50.0 | 49.5% | ||
| Alberta Slip 1000F Roasted | 50.0 | 49.5% | ||
| Additions | ||||
| Mason 6666 or 6600 | 1.0 | 1.0% | ||
| 101.00 | ||||
| Rate (C) | Temp (C) | Hold (Min) | Step |
| 10 | 120 | 0 | 1 |
| 50 | 550 | 0 | 2 |
| 100 | 980 | 0 | 3 |
| 50 | 1300 | 0 | 4 |
| 0 | 1300 | 30 | 5 |
| Freefall | 30 | 6 |
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.
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).
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.
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.
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.
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.
Out Bound Links
- UnDescribed
Archie Bray Slip
In Bound Links
You can make a tenmoku from Alberta Slip by adding only 2% iron oxide and 5% calcium carbonate
2003-12-12 - Tenmoku glazes normally contain 10%+ iron oxide, they are extremely messy to use and often have poor slurry suspension properties and are difficult to...
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By Tony Hansen 
