iandol on sat 30 sep 00
I saw the original posting and thought it curious that a process could =
be registered as copyright, though in some countries I believe it is =
possible to register the imagery of one's work.
What did concern me, and I have waited patiently for one of the more =
technical in our crew to mention it, is that many copper enamels are =
compounded from lead based silicates though the safe ones have other =
basic compositions which melt at low temperatures.
Now, as I understand it, reduction is not a thing one does to lead based =
ceramic materials because it destabilises the composition and can result =
in metallic lead coming to the surface of the work, effectively =
destroying it..
So, what is the good oil on this one. Does reducing enamel ware cause =
problems?
Ivor Lewis. Redhill, South Australia
Janet Kaiser on sun 1 oct 00
Dear Ivor
Strangely enough this ties in with the tin-glaze
thread. The historic Málaga ware from Spain had
an amazing lustre which was the result of
careful reduction. There are examples of it in
museums around the world after several hundred
years, so I do not see that there could be a
difficulty with stability.
We also used lead glazes for all our raku at
college. The post-firing reduction did the glaze
no harm either. Still have examples which show
no sign of deterioration.
I will be interested to see what others say, but
I cannot see any cause for concern on enamel. I
would, however, be surprised to hear that lead
is still being used. Not having worked with
enamels recently (last 20 odd years) I am open
to correction on that.
Best wishes
Janet Kaiser
The Chapel of Art . Capel Celfyddyd
HOME OF THE INTERNATIONAL POTTERS' PATH
Criccieth LL52 0EA, GB-Wales Tel: (01766) 523570
E-mail: postbox@the-coa.org.uk
WEBSITE: http://www.the-coa.org.uk
----- Original Message -----
Now, as I understand it, reduction is not a
thing one does to lead based ceramic materials
because it destabilises the composition and can
result in metallic lead coming to the surface of
the work, effectively destroying it.
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