Chris Schafale on sun 3 dec 00
Here's my question: Obviously, lots of people use chrome in their
glazes. Do they not have this problem (fuming and tin "pinking")?
Do they just avoid using tin in their glazes? Are "tin-glaze potters"
and "chrome-glaze potters" mutually exclusive groups (except for
"chrome-tin pink potters")? What's the deal?
Chris Schafale
Very tempted by emerald greens made from chrome and cobalt....
but liking my tin whites just as they are, thank you.
Date sent: Thu, 30 Nov 2000 09:06:50 -0700
Send reply to: selsor@imt.net
From: Marcia Selsor
Subject: Re: Does chromium oxide in stains travel?
To: CLAYART@LSV.CERAMICS.ORG
> Carol,
> We had to dispose of chrome in the school lab about 7 years ago, BUT
> chrome does travel in a kiln and can cause a tin white to blush pink. I
> can't say whether stains with chrome do the same.
> Marcia
>
> C TRIPP wrote:
> >
> > I've never used chromium oxide in any form but now I am thinking about
> > trying some Mason stains containing it. I make functional pottery, firing in
> > an electric kiln and would be mixing the chromium containing stain with a
> > clear, stable glaze to go on non-food bearing surfaces. Will the chromium
> > oxide in the stain travel to other pieces with glazes containing tin oxide
> > causing unwanted discoloration? If so, what to do about it; do quarantine
> > firings? And what about fumes?
> >
> > Thanks. Carol
> >
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> --
> Marcia Selsor
> selsor@imt.net
> http://www.imt.net/~mjbmls
> http://www.imt.net/~mjbmls/Tuscany2001.html
>
> ______________________________________________________________________________
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>
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> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
Light One Candle Pottery
Fuquay-Varina, North Carolina, USA
(south of Raleigh)
candle@intrex.net
http://www.lightonecandle.com
John Hesselberth on sun 3 dec 00
Chris Schafale wrote:
>Here's my question: Obviously, lots of people use chrome in their
>glazes. Do they not have this problem (fuming and tin "pinking")?
>Do they just avoid using tin in their glazes? Are "tin-glaze potters"
>and "chrome-glaze potters" mutually exclusive groups (except for
>"chrome-tin pink potters")? What's the deal?
Hi Chris,
I think you said it just about right. I nearly always use Zircopax
and/or titanium dioxide (in the form of rutile) when I want opacity for 2
reasons: They are cheaper and I don't have to worry about chrome
flashing. When I want chrome-tin-pink I can have it without worrying
about contaminating other glazes. Also I can use chrome as a colorant in
other glazes without worrying about flashing. It works for me. John
"The life so short, the craft so long to learn." Hippocrates, 5th cent.
B.C.
Cindy Strnad on sun 3 dec 00
Hi, Chris.
I think you kind of hit it on the head. I can't tell you for sure, but no, I
don't think most potters routinely use tin to opacify glazes. As you're
aware, it's pretty pricey. I'd need a good aesthetic reason for using it
instead of some less expensive opacifier--such as a chrome-tin pink.
I wouldn't be averse to using tin in other glazes in which I could tell the
difference between tin and zircopax (for example), but I'd never use it if
it didn't seem to make a real positive difference.
Actually, I don't use opacifiers (unless you count rutile) in very many of
my glazes, in any case.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
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