C TRIPP on tue 28 nov 00
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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Martin Howard on wed 29 nov 00
Carol, test, test, test. The CrO2 will travel and affect any Sn based glaze
that is nearby.
How, close? Test will show. So you will waste a substantial amount of kiln
space on these tests, IF you do not want other saleable ware to be altered.
I have no tin based glaze now in my kiln, partly because one effect I need
is CrO2 rims on a 3% copper glazed plates. The rims go speckled with the
chrome green over the copper green.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
OWLPOTTER@AOL.COM on wed 29 nov 00
I also fire in electric kilns. In my experience, yes. Using the Mason
stains containing chrome caused a lot of "pinking up" in other glazes,
especially those containing tin. And I've had the problem continue after
several firings with them, even though there were no chrome containing glazes
in the kiln. I concluded that it does stay in the kiln somehow.
Carolynn Palmer, Somerset Center, Michigan
Marcia Selsor on thu 30 nov 00
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
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