Malone & Dean McRaine on thu 12 jun 97
I posted a great ^10 oxidation black called Kelly Cowan Black about three
weeks ago under the heading ^10 oxidation (I think) along with a number of
other ^10 ox glazes I use. The text of that post follows. Do you have any
tested ^10 ox recipes you like and would share? Enjoy.
From Kauai, hot & humid
A little White wine is all I need to loosen my lip and my grip on my
precious stock of ^10 Ox recipes. Actually, I've had a lot moire than that
and plan on finishing the bottle before this message is dfone so let me
saynow, USE 'EM AT YER OWN RISK!
I had a lot of replyse tio my post on ^10 Ox glazes but have been off line.
The gods have blessed me with a country home on the north shore of Kauai to
which I had to move very quickly. Moving a home and studio to a smaller
space is a load of work and I think there was a dimensional shift in ther to
boot. Regardless, I am ecstatic to live in such a beautifyul place. ( I
could correct the typos but it heightens the inebriated quality, don't you
I apologize, I digress. Here are some of the ^10 Oxidation glazes I have
had goo luck with over the yearss. I use Dave's porcelain from Laguna.
13 Gerstly Borate
59.5 Custar Spar
3.8 Ball Clay
0.54 copper Carb
13 barium (Can substitute 9-13 Strontnium to make it food safe)
Nice light robin's egg blue gloss, stable, pretty, unusual, similar to peach
blossom but less texture.
Emmanuel Cooper's Blue Crystal #383
35 G-200 Spar (Custar works too)
1.5 Cobalt Carb.
You better have some wine yerself befor youtry this one! Quite variable.
At its best a beautiful slate blue with small crystals (1/16") peppering
the surface (green centers w/ white halo). slightly fluid. Narrow firing
range, just Knock down ^10 and leave it at that, soak it slightly cooler. I
usually soak between 2050-2150 F ( I think my pyrometer is a little low).
Soak time is important. Longer soak and the crystals completely cover the
surface. I found a 1/2 hr soak was about right. beautiful no matter how you
fire it. I've sold a lot of this.
Cobalt Green (from CM)
2 Gerstly Borate
70 Neph sy
8 ball clay
1 cobalt carb
Nice, rich, appealing. Unlike any green you've ever seen. Breaks white over
raised decoration. Viscosity is important as glaze varies with thickness.
Thick=bright green, medium=dark green, thin=grey-blue.
30.8 Custar spar
3.6 Gerstly Borate
0.9 cobalt carb
0.45 Chrome Ox.
Bulletproof. Great at all temps and thicknesses. Very stable
33 Ball clay (OM-4)
Simple, easy tan. Semi-matt.
Kelly Cowan's black
42 Soda spar
3.5 red iron oxide
3.5 chrome ox
3.5 manganese ox
3.5 cobalt carb
Stable semimatt black. You can reduce the cobalt and increase the other
metals to save some $$.
30 Custar Spar
20 Ball clay (OM-4)
15 Bone Ash
10 Iron ox
Nice iron red, stable.
Waxy White / Lavender
41 potash spar (custar, g-200)
17 Gerstley Borate
5 Ball Clay
for lavender add
to breakup surface a bit add
Bulletproof. Smooth semimatt. White is good over colored slips. Lavender
is great, ranges from pinkish to almost blue, popular. All temps and
Good in reduction.
40 any spar
3 Zinc ox
Aprocot at ^9, the hotter it gets the more I like it. More pink and broken
surface. Good in a wood kiln in reduction, too.
27.6 Neph sy
17.1 Gerstley Borate
0.3 copper carb
0.3 yellow ochre
0.3 tin ox
Pretty light blue. Needs to be thickish, but will run a little, don't overfire.
38.5 Custar Spar
1.8 Cobalt carb
Non- toxic version of barium matt blue. Stable, strong color.
Touch of Moon ( I never understood this name)
50 Neph sy
1 cobalt carb
1 chrome ox
Dark semi-matt jade/marble green. Looks like stone.
That's it. Good luck.