Bill Edwards on mon 7 oct 02
Hi,
Those who have wondered about the chrome tin glazes
might consider doing one of two things. To get those
pinks, lower the Al203 in the Tin Oxide glaze. To
reduce the pinking balance it out for the firing temp
you are trying to arrive at by upping the AL203 to a
balanced point recommended for whatever heat range you
work in.
I am not trying to get involved in toxicity issues or
alarming. If you need to know about that they are
others who will provide that. Below is a place to
source out some info but I find very little concern
over the use of the amount of chromium I use but wear
gloves and breathing apparatus and have the usual
FDA/FSIS lab tests done regardless of RDA's to help
you learn more about the work you are involved in.
EPA has set a limit of 100 µg chromium(III) and
chromium(VI) per liter of drinking water (100 µg/L).
The Occupational Safety and Health Administration
(OSHA) has set limits of 500 µg water soluble
chromium(III) compounds per cubic meter of workplace
air (500 µg/m3), 1,000 µg/m3 for metallic chromium(0)
and insoluble chromium compounds, and 52 µg/m3 for
chromium(VI) compounds for 8-hour work shifts and
40-hour work weeks.
William Edwards
=====
http://www.tallapoosariverpottery.com/
Bill Edwards
PO Box 267
Lafayette, AL, 36862
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