Des & Jan Howard on sat 4 mar 06
Hang about, just found this
http://webexhibits.org/pigments/indiv/recipe/egyptblue.html
Heating a mixture of a calcium compound (carbonate, sulfate or
hydroxide), copper compound (oxide or malachite) and quartz or silica
gel in proportions that correspond to a ratio of 4 SiO_2 : 1 CaO : 1 CuO
to a temperature of 900°C using a flux of sodium carbonate, potassium
carbonate or borax. The mixture is then maintained at a temperature of
800°C for a period ranging from 10 to 100 hours.
Well, there you go :-)
Des
Des & Jan Howard wrote:
> Ivor
> Adding something like soda ash may stuff up the result.
> Another possibility to assist in the melt is to ball mill the
> ingredients for 24-36 hours, don't decant excess water until clear.
> Arabia once made a flameproof body, the only glaze possible was the
> fired body ball milled to micro-fine slip.
> Des
>
> Ivor and Olive Lewis wrote:
>
>> Must make some of this stuff. I will fire at cone 8 and use Soda ash
>> as a flux.
>>
>>
>
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
Ivor and Olive Lewis on sun 5 mar 06
Dear Des Howard,=20
Bet you a plugged nickel to a bent brass pin the chap who wrote that has =
not done the task.
Must get into the studio and prepare some samples.
All he best,
Ivor
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