| Monthly Tech-Tip |
|
Use Plainsman Clays? 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.
Related Information
Alberta Slip as a base for glossy black glazes at cone 10R
This picture has its own page with more detail, click here to see it.
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 picture has its own page with more detail, click here to see it.
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
This picture has its own page with more detail, click here to see it.
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
This picture has its own page with more detail, click here to see it.
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
This picture has its own page with more detail, click here to see it.
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. |
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