Leona Stonebridge Arthen on fri 9 aug 96
Hi all,
I have a question that's been confusing me for some time. My glaze recipe
books list chrome as one of the green-producing oxides. When I mix up a
slip or a glaze containing chrome, the mixture is green; it bisques green
but it glaze fires at c9 to pinkish beige. Lovely in itself, but why don't
I get green?
Similarly, my books refer to manganese for purple. I get black or nothing
at all.
I have tried these in several glaze bases (borosilicate, feldspathic, soda)
and it doesn't change the result.
Leona,
- not looking forward to changing the element that gave out in the middle
of a glaze burn :^(
SLPBM@cc.usu.edu on fri 9 aug 96
With regard to your chrome glaze turning pink- consider the possibility of
a chrome-tin pink being the culprit. See Parmelee's book for more help.
June Perry on sat 10 aug 96
Leona:
Are you using tin with your chrome? Tin and chrome together in a low or no
calcium glaze can give pink. This may be a silly question but do you think
you may be be using some mismarked copper carbonate? Probably not, just a
wild stab since you mentioned you have used several base formulas and are
still getting pink with the chrome.
For the manganese lilac you may want to try a zinc free glaze with a lot of
alkaline materials making up the RO column and a high alumina content.
Perhaps someone has a recipe. My own desk is in a shambles at the moment. But
I know I had a note relating to the lilac manganese glazes.
Perhaps someone more knowlegeable will come forth with more wisdom here.
Regards,
June Perry
Email: juneperry@wave.net
Sam Cuttell on sun 11 aug 96
At 02:17 PM 8/9/96 EDT, you wrote:
>----------------------------Original message----------------------------
>Hi all,
>
>I have a question that's been confusing me for some time. My glaze recipe
>books list chrome as one of the green-producing oxides. When I mix up a
>slip or a glaze containing chrome, the mixture is green; it bisques green
>but it glaze fires at c9 to pinkish beige. Lovely in itself, but why don't
>I get green?
>
Are you using tin? Is this fired in oxidation? Would you be willing to
send me the recipe privately (I'd love a pink to add to my glaze collection!!!)
THANKS IN ADVANCE!
sam - alias the cat lady
Home of Manx cats, Cavaliers and the odd horse
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