randall.moody at gmail.com
Sat Jan 25 18:52:45 EST 2014
While I have found adequate scientific data on the issue of manganese in
the use of making glazes, I have yet to find anything that supports the
disuse of barium.
On Sat, Jan 25, 2014 at 4:42 PM, mel jacobson <melpots2 at visi.com> wrote:
> and manganese are both question marks in
> functional ware.
> there are some that think that using high
> percentages of manganese will allow it
> to fume off the kiln and it can be very dangerous.
> (the air quality around the kiln)
> many thought that david shaner may have been
> affected by his 20% manganese glaze.)
> because it was a question mark, i have stopped using
> it in public places like schools and art centers.
> (i just did not want anything on my shelves at the high
> school that could come back to haunt me.)
> others with fuller chemistry backgrounds can fill us
> in more.
> i know that an experienced potter /sculptor can
> use even lead, if they know what they are doing
> and take precaution.
> i base my thoughts on those that have no experience
> and use old recipes...without any thought.
> my entire post was about whiting (calcium carbonate) and other
> non/toxic materials that can be spread on the lawn
> or disposed of around a rough area.
> i dig in iron oxide glaze around my flowers. and, i never
> dump clay, glaze or other potters materials in the
> city pick up waste disposal.
> of course, i have a hundred acre farm that i can
> enrich the soil with that sort of thing.
> from: minnetonka, mn
> website: http://www.visi.com/~melpots/
> clayart link: http://www.visi.com/~melpots/clayart.html
> new book: http://www.21stcenturykilns.com
> clayart: http://www.ceramicist.org
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Randall in Atlanta
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