Earl Brunner on tue 13 feb 01
This looks a lot like a cone 6 glaze we use at the art center called
"Plum". I too was concerned about the potassium bi/dichromate in the
recipe. I recalculated the original (with the Gerstley Borate) to
eliminate the potassium bi/dichromate and substituted Chrome Oxide. I
haven't reformulated to replace Gerstley Borate because we still have some.
Plum (revised)
Volcanic Ash 54
Gerstley Borate 18.6
Whiting
18.2
EPK 1.3
Tin Oxide 6.7
Chrome Oxide .15
BTW this glaze is doing great stuff with Floating Blue.
Joan Walton wrote:
> I have a cone 6 chrome/tin glaze recipe that really
> works that uses potassium di(bi)chromate. I have been
> told that this is a very unstable material and highly
> toxic, and one should wear rubber gloves when mixing
> and applying it because the chrome is soluble and able
> to be absorbed through the skin. Is this true? It
> looks pretty nasty, a poisonous yellow, sitting in the
> bucket!
>
> Nevertheless, this glaze is really beautiful, a rich
> crimson maroon at its best, like ripe cherries. And
> revised to be gerstley free! So here is the recipe:
>
> PLUM ? 6
>
> Pumice 70
> frit 3134 25
> EPK 5
> Whiting 24
>
> total 124
>
> add:
> Tin oxide 9
> Potassium bichrom. 1
> Bentonite 1
>
> joan in brooklyn where it feels like forsythia time.
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
Joan Walton on tue 13 feb 01
I have a cone 6 chrome/tin glaze recipe that really
works that uses potassium di(bi)chromate. I have been
told that this is a very unstable material and highly
toxic, and one should wear rubber gloves when mixing
and applying it because the chrome is soluble and able
to be absorbed through the skin. Is this true? It
looks pretty nasty, a poisonous yellow, sitting in the
bucket!
Nevertheless, this glaze is really beautiful, a rich
crimson maroon at its best, like ripe cherries. And
revised to be gerstley free! So here is the recipe:
PLUM ? 6
Pumice 70
frit 3134 25
EPK 5
Whiting 24
total 124
add:
Tin oxide 9
Potassium bichrom. 1
Bentonite 1
joan in brooklyn where it feels like forsythia time.
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Dannon Rhudy on wed 14 feb 01
At 07:17 PM 02/13/2001 -0800, you wrote:
>I have a ... glaze recipe that really
>works that uses potassium di(bi)chromate....been
>told that this is .....highly toxic.....
Potassium bichromate(dichromate) is highly toxic.
Not only do you not want it on your hands, you don't even
want to pour it down the drain. I would not care to breathe
the fumes when firing, either. We used it for a time in a class
print-making process to sensitize large sheets of film, but
the professor stopped it because of the toxicity of the potassium
bichromate. Even disposal was a problem, never mind everything
else.
Regards
Dannon Rhudy
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