chrisclarke on wed 13 sep 00
Hi,
I've had so many requests for glazes and I've tried to write everyone
individually but I'm loosing track, so I'll just post them. First a
note: I first start with formulating a base glaze, sometime I get them
from CM or Claytimes and tweak them to fit. I kind of willy nilly put
colorants in. My glazes samples are 200g, mixing up 2000g of the base
allows me nine samples (should be ten but you loose a little here and
there and the last sample will not be 200g, unless you are perfect). I
work in white stoneware from Kickwheel in Georgia (I know, I live in
California). Please test, everyone does things a little different, and
we have all gotten our chemicals from different suppliers.
Marge's Clear
17% calcium carbonate
35 custer feldspar (have used other feldspars with success)
12 ball clay
19 silica
17 zinc oxide
This is a glossy clear that has the tendency to form small crystals. It
move a little, a little more when thick. Will fuzz up oxide designs
under it. I airbrush colorants over it, with nice results.
Add to Marge's Clear-
Anthracite (I let my husband name it : )
5% rutile
15 red iron oxide
3 cobalt oxide
This is a very, very dark glaze, kind of satiny. It is not sapphire,
but breaks brown and has a tan dust. I'm going to test it with less red
iron to see if I can brighten it a little. Maybe add cobalt carbonate
(big difference between oxide and carbonate) to get an over all bluer
shade.
Add to Marge's Clear-
Pale Green
10% rutile
0.5 cobalt carbonate
This is a light green glaze that is creamy. It's coloration is varied.
It moves, so be careful.
Add to Marge's Clear-
Snowflake
3% cobalt carbonate
2 copper carbonate
1 rutile
This is a dark glossy blue that where thick goes light blue. It moves
and streaks, thin areas are sometimes green.
I'll post more later, and again, please test. Hope these work, I'll
worry for days that you guys don't get what you want from them. Also,
this base has been in my book since my junior year in college when I got
it from a grad student. I've used it for all these years and
substituted different chemicals from different sources. Speckled yellow
can be achieved with black iron, smooth lemon yellow with vanadium.
Bright blue with a little cobalt carb., super pax, and rutile. I like
to add rutile to everything to give some dimension. Test, test, test.
chris@ccpots
L. P. Skeen on wed 13 sep 00
> Add to Marge's Clear-
> Anthracite (I let my husband name it : )
> 5% rutile
> 15 red iron oxide
> 3 cobalt oxide
>
> This is a very, very dark glaze, kind of satiny. It is not sapphire,
> but breaks brown and has a tan dust. I'm going to test it with less red
> iron to see if I can brighten it a little. Maybe add cobalt carbonate
> (big difference between oxide and carbonate) to get an over all bluer
> shade.
Chris,
The glaze is so dark because you're using so much cobalt oxide. Cobalt is a
very strong colorant, whether oxide or carbonate form. Carbonate is weaker
than the oxide. Try subbing out the carbonate for the oxide in this recipe
and see what you get. I'm guessing it'll be somewhat like floating blue.
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