Heidi Haugen on sun 4 mar 01
hi kurt, i'm jumping in just in case john hesselberth is too swamped
with nceca prep but 10 bucks says he's already written to you.
i had the same confusion with my first test results from alfred. along
with the numbers, i even got a rather confusing narrative stating that
"this glaze would probably be safe for functional ware"-what the hell
does "probably" mean i said. i even shed a few tears as the letter also
came with drinking water guidelines. my glaze (xavier's warm jade
green, cone 6) leached somewhere around 4 ppm and drinking water
guidelines were somewhere around 1ppm so i was sure this glaze had
failed with flying colors.
wrote to john for some interpretive help and he was so excited because
this turned out to be one of the lowest copper leaching glazes he had
seen tested (recipe calls for 4% copper carb).
anyway, to answer your question..there are no guidelines/regs for
leachates other than barium, lead and cadmium (i believe) and therefore
no hard and fast rules about numbers but what your numbers say is that
they can only detect it at .01ppm and yours was lower than the
detectable limit which i interpret as great news about this glaze. john
may be able to clarify more but if it's undetectable, my answer would be
that it is food-safe (as far as we know at this time with methods
available.)
hope this helps.
heidi haugen in montana (supposed to reach high 40's this week---wahoo!)
Bill Merrill on thu 29 oct 09
I just received an email from Val Cushing...He said... "There was a
big fire today in Alfred. Part of the "business block" burned to the
ground. It's a sad sight and the "look" of old Alfred will never be
quite the same."
=3D20
When the graduate studio at Alfred was a separate old building called
Glidden, there was a great car kiln there that was about 100 cubic feet
and had 10 Alfred burners on it. It was possibly one of the best kilns
I was lucky enough to fire. In the summer of '73 the kiln was over
reduced by a student and caught the roof on fire around the back of the
chimney and flu area. The Alfred fire department came to the studio,
put out the fire and let the kiln continue to fire. They knew what was
going on and didn't over react and try and put out the kiln the way the
fire department did to Dave Shaners wood fired kiln when he was firing.
It ruined all of Daves pots, broke all the kiln shelves and ruined the
kiln. Dave fought with the insurance company for years over that
fiasco.
=3D20
=3D20
Dannon Rhudy on thu 29 oct 09
Bill Merrill said:
I just received an email from Val Cushing...He said... "There was a
big fire today in Alfred. Part of the "business block" burned to the
ground. It's a sad sight and the "look" of old Alfred will never be
quite the same."
Fire department...... didn't over react and try and put out the kiln the
way the
fire department did to Dave Shaners wood fired kiln when he was firing.....=
.
I'm sorry to hear re: Alfred. A very pleasant little town, with a
beautiful setting.
Re: fire departments/kilns: I found it really useful to invite the
fire department to the teaching studio at the beginning of the
Fall term, talk to them re: the kiln(s), etc. They really had no
idea, initially, how hot the kiln gets. When they found out,
they were VERY thoughtful about the results of shooting water
onto/into a box that might be more than 2,000 F inside. They
seemed glad to find out what was going on, and the fire chief
made sure that the firemen were aware of the kilns, where they
were, etc. Never problems, and I called them in advance of
raku and pit firings, to let them know there'd be smoke. Saved
them trips more than once. And a few mugs now and again did
not hurt.
regards
Dannon Rhudy
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