Lynne Antone on sun 29 oct 06
I am doing some glaze tests today and tomorrow and wanted to try to get a Transparent Purple glaze to pick up stamping and incising on my pots. I have a nice purple already, but it is opaque and mostly covers up all of my design work. In my purple glaze I use Tin Oxide and Green Chrome Oxide along with Cobalt Carb. to get the purple color. I think I understand that the Tin is an opacifier and suspect that the Green Chrome is also.
The two bases that I plan to use are:
Custer Feld
What else can I use, besides a Mason Stain, to get a glossy, clear purple?
--
"Whenever I feel blue, I just start breathing again"
Beaver Creek Arts
Olympia WA
USA
Daniel Semler on sun 29 oct 06
Hi Lynne,
It sounds like what you have is a chrome tin pink made purple by
the addition of some cobalt. Removing the tin would likely affect the
colour, dramatically I expect. While tin can act as an opacifier I
suspect its critical to the colour here.
A little cobalt and a bunch of magnesia (from dolomite, mag carb
(has issues in quantity), talc etc) you can get purple. I've tried
this with a satin matte, but not a gloss, so mine's not transparent. I
don't know if it would help as a starting point for you, as I was
working at cone 10. The results are on
if its of use to you.
Thanx
D
Snail Scott on mon 30 oct 06
At 02:40 PM 10/29/2006 -0600, you wrote:
>...A little cobalt and a bunch of magnesia (from dolomite, mag carb
>(has issues in quantity), talc etc) you can get purple. I've tried
>this with a satin matte, but not a gloss, so mine's not transparent.
Cobalt/mag purples are microcrystalline
mattes. The magnesium that causes the purple
also causes the matteness. It might be
possible to cool such a glaze fast enough
to avoid the crystal growth, but judging by
some 'borderline' recipes I've used, you
would also lose the purple.
How about trying an optical mix instead of
a chemical mix? An underglaze wipe of a
purple, with a clear glaze over, or an
underglaze wipe of a pink/burgundy red
with a transparent blue over top? Or
high-fire the clay and use a low-fire
purple glaze?
-Snail
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