SAMUEL DREW on tue 13 aug 96
TO CLAYART USERS,
I WAS WANTING TO KNOW OF ANYBODY WHO HAS USED SODA BICARBONATE AS A
GLAZE BY ITSELF OR AS A PRIMARY INGREDIENT IN A GLAZE? WANT TO COMBAT
THE USE OF HIGH PRICE FRITS.I CAN SEE SPRAYING THE GLAZE ON DUE TO
HIGH SOLUBILITY IS THE ONLY MEANS OF APPLICATION.
HELP
MR.DREW
John Blossom Pottery on wed 14 aug 96
>----------------------------Original message----------------------------
>TO CLAYART USERS,
>I WAS WANTING TO KNOW OF ANYBODY WHO HAS USED SODA BICARBONATE AS A
>GLAZE BY ITSELF OR AS A PRIMARY INGREDIENT IN A GLAZE? WANT TO COMBAT
>THE USE OF HIGH PRICE FRITS.I CAN SEE SPRAYING THE GLAZE ON DUE TO
>HIGH SOLUBILITY IS THE ONLY MEANS OF APPLICATION.
>
>HELP
>MR.DREW
I sometimes use it as a "wash." (One part to four parts water, stir
constantly, and apply by brush.) You can add colorants. It will often
"spit" onto your shelves, and it can blister depending on the clay body
used. I gave this idea to Vivika Heino two years before she passed away,
and she used it successfully on a few porcelain globes fired in gas
reduction. (Add a tablespoon of copper carbonate, and on a porcelainous
white body fired in reduction you would swear it was fired in an anagama.
Nice flashes of orange.)
Be aware that over time it will act like salt and attack your bricks,
shelves, etc.
-John Blossom
KEMPB on thu 15 aug 96
Hi Mr. Drew,
Back in Geelong, Australia when we had our Raku Days
where we had firings for the public, to cut down on costs we made glazes
from Sodium Bicarbonate (Baking Soda) and borax. Both are cheap and
available at the Supermarket.
Unfortunately I can't remember the proportions but a simple five part line
blend would quickly give you the answer.
Brian Kemp. Singapore
kempb@nievax.nie.ac.sg
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