iandol on sun 20 apr 03
Dear Friends,
Reading between the lines about Copper Carbonate, and in my 1st edition =
of Hamer, it would appear that there are two compounds which we might =
have to deal with.
There is the carbonate derived from Malachite, a natural mineral with a =
composition which includes two hydroxyl groups, Aka Cu2CO3(OH)2, and =
what must be manufactured chemical given by Hamer as CuCO3.
Interesting and confusing. Read Hamer and Fournier.
Best regards,
Ivor Lewis
John Hesselberth on mon 21 apr 03
Hi Ivor,
All of the materials sold to potters in North America as copper
carbonate are really basic copper carbonate (synthetic malachite). It
appears pretty obvious at this point from Sandy and Ruth's notes that
there are at least two grades and/or mesh sizes out there. Ruth is
sending me a sample so I can compare it to the ones I have.
At this point I would say to everyone--if buy copper carbonate and it
is 'grainy', send it back and buy from someplace else. Don't accept
it. It should be a fine powder just like all glaze chemicals are
(well, most--wollastonite could be called a bit grainy but the lumps
break up when you screen them).
Regards,
John
On Sunday, April 20, 2003, at 03:15 AM, iandol wrote:
> There is the carbonate derived from Malachite, a natural mineral with
> a composition which includes two hydroxyl groups, Aka Cu2CO3(OH)2, and
> what must be manufactured chemical given by Hamer as CuCO3.
> Interesting and confusing.
http://www.frogpondpottery.com
http://www.masteringglazes.com
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