White glazes for terracotta
Traditionally the best white cover glazes for terracotta are made with Tin. Tin is a rare metal, and I try to avoid contributing to depleting the earth’s rare minerals and resources, especially when there exist good alternatives. Good for your wallet too, since “rare” often means “expensive”.
Recipes for white cover glaze Cone 05 for terracotta.
Q02:
20 High alkali frit P2962.1
5 parts Feldspar Soda
5 Chalk
5 Magnesium Carbonate
It’s a start, absolutely interesting, I like how the glaze colors the terracotta without even covering it. The holes in the glaze are related to lumps in the glaze mix.
Q03
20 parts Borax frit P2953-01
5 parts Feldspar Soda
5 Chalk
It did not turn out white at all, but I like it: Glossy, frosty with bubbles
Q04
20 High alkali frit P2962.1
5 parts Kaolin
5 Quarts
4 Magnesium Carbonate
As thin it’s white with a good covering ability and a hard surface. I liked it even better as thick where it is a combination of transparent and glossy, and white “snowflakes” in it.
Q01:
20% parts Borax frit P2953-01
5% parts Feldspar Soda
5% parts Talc
5% parts Kaolin
Not a finished glaze; yellow-white with cracks and pinholes, at thin it was quite ok.
White cover glaze from books:
From the book: Fired up with raku, by Irene Poulton.
Antique White (creamy white):
80% Gerstley Borate
20% Talc
From the book: Low-Fire Soda by Justin Rothshank.
Logan Wall’s Bills basic liner (white glossy):
65,8% Ferro Frit 3124
17,1% Kona F-4 Feldspar
6,5% Nephelin Syenite
10,8% Kaolin
Additives:
14% Zircopax
0,5% Rutile
2% Bentonite
From the book: AMAZING GLAZE by Gabriel Kline.
Chris Gustin White:
40% Frit 3124
30% Gersley Borate
25% Nepheline Syenite
5% Silica
Addetivs:
8% Zircopax