June Perry on tue 15 oct 02
Connie, just take any magnesia (talc, dolomite or magnesium carboante) satin
base and add 1-2% cobalt oxide and you'll get purple. Depending on the
magnesia content, you'll either get a purplish blue or real purple is there's
enough magnesia in there.
Here's a base that would give you the purple
#4 Buttery Waxy Matt 9-10 R I've had this glaze for about 28 years. I'm not
sure of the source but it may be a Carlton Ball recipe.
CUSTER FELDSPAR 41
GERSLEY BORATE 12
DOLOMITE 7
TALC 15
KAOLIN 5
FLINT 20
This will give you a really lavender glaze with only 1/2% cobalt oxide(looks
like those light purple easter eggs!). It's for died in the wool purple
lovers only I think! For the deeper purple try 1-2%. Cobalt oxide.
You might also try substituting whiting for the dolomite in one test with the
cobalt and your might get a more purplish blue. Then test equal parts of the
first test and the second and you'll get a good idea of where you might want
to refine it.
It's also a nice white alone, or with Opacifier. I think I used it years ago
with about 1% rutile. It's been sooo long, I'm not sure!
Here's another one. I haven't tested this one, nor have I run either of then
through my glaze program to see if they're within limits.
# 979 BLUE PURPLE W/MAUVE PATCHES C10 SEMI MATT
POTASH FELDSPAR 36
WHITING 13
DOLOMITE 15
ZINC OXIDE 1
KAOLIN 8
FLINT 24
MANGANESE DIOXIDE 3
COBALT OXIDE .2
Regards,
June Perry
http://www.angelfire.com/art2/shambhalapottery/index.html
Connie Woodward on tue 15 oct 02
I am trying to find a recipe for a glaze I used before,
we just called it "blue-purple".
it fires at cone 10 (we always did it in redution),
a buttery texture (satin-gloss at best), medium-light purple with
dark blue flecks. I searched the archives, but didn't turn
up anything that seemed like what I was looking for...
anyone know of this glaze?
thanks,
Connie
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Connie Woodward connie@karattopp.com 713-256-5907
Navasota, TX www.karattopp.com
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