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glaze test result:golden fake ash

updated thu 29 jul 04


Tracy Cooper on sun 25 jul 04

I just pulled this test out and it looks like it is going to be an interesting glaze.

I fired to cone 6 in oxidation and applied it to cone 6 porcelain, thickly on the interior or a tapered bowl and average thickness on the exterior. Where it was thickest it beaded up and ran, though not in nice rivulets but maybe it was a bit too thick I'm thinking. The thickest parts also tended to turn more yellow as opposed to the light tan/yellow where thinner.

The exterior of the bowl (backside) was thinner in application and resulted in a nice stable gloss tan/yellow, no real running or instability. Near the rim where it was thickest it did bead up a little which is what I wanted from a fake ash glaze.

My test tile was an extruded square cylinder and showed less beading where thick, it was more of a uniform tan/yellow with a gloss surface. I'd say this glaze would be interesting to play with on decorative wares but of course you could also try throwing in some real wood ash to other glazes and see what happens.

Golden Fake Ash
Cone 6 oxidation
Source: Clayart Archives.

Redart 29
OM4 21
Bone Ash 5
Strontium 9
Dolomite 24
Gerstley 10 Substituted Laguna Borate for Gerstley.
Lithium 2

percents on a 100 grams

Have a great day!

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Ron Roy on wed 28 jul 04

For those who are interested - this glaze is way short of silica and will
not be durable - it will degrade when in contact with acidic foods and may
be affected by dish washing over time. It will also craze on most clay

I would not recommend it as a liner.


>Golden Fake Ash
>Cone 6 oxidation
>Source: Clayart Archives.
>Redart 29
>OM4 21
>Bone Ash 5
>Strontium 9
>Dolomite 24
>Gerstley 10 Substituted Laguna Borate for Gerstley.
>Lithium 2

Ron Roy
15084 Little Lake Road
Brighton, Ontario
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513