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Author Topic: Egyptian paste or faience  (Read 63 times)

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lithicbeads

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Egyptian paste or faience
« on: May 19, 2017, 10:15:48 AM »

 This formula for Egyptian paste comes from the recently deceased Robin Hopper the famous Canadian potter , gardener and educator. He received the Order of Canada shortly before he died  a gigantic tribute from his adopted country. Feldspar 40 % , silica 20 % , kaolin 15 % , ball clay 5 % , sodium bicarbonate 6 % , soda ash 6 % , calcium carbonate 5 % , fine white sand 8 % ,bentonite 5 % .This is not a clay it is packed into a mold or crudely modeled. It is porous so that the oxides can migrate to the surface during drying and firing to provide color. Copper oxide or copper carbonate  at about 3 % will give the strong turquoise color that is traditional. Other oxides and mason stains may also be used. It is fired at cone  012 to 04 with the standard being cone 08.
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ileney

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Re: Egyptian paste or faience
« Reply #1 on: May 19, 2017, 10:31:30 AM »

Very interesting. I always wondered how it was made.
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lithicbeads

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Re: Egyptian paste or faience
« Reply #2 on: May 19, 2017, 07:06:04 PM »

Here is another similar formula from "  Ceramics " fourth edition written by Glen C. Nelson.cone 08 self glazing body. 40% Buckingham spar ( feldspar) , 20  % flint ( silica) , 15 kaolin , 6 % bicarbonate of soda , 6 % soda ash . 5 % ball clay , 5 % dolomite , 3 % bentonite. Colorants : purple - blue 3/4 % cobalt ;light green 1 % copper  carbonate ; yellow 7 % vanadium stain.  The composition of Buckingham spar is sio2 65.5 % , al2o3 19.5 % , cao .16 % , mgo .2 % , k2o 12.4 % , na2o 2.6 %.
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