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: re: lustre

updated sun 20 apr 03

 

iandol on fri 18 apr 03


Dear Marcia Selsor,

You were fortunate to access the old texts and to be able to read them.

Yes, there is a consensus that Moorish or smoked lustre is a reduction =
process. I think this is brought out in the book by Piccolpasso who =
describes the best sorts of grasses to get the right conditions. I have =
found that with Silver Sulphide in Ochre as the active agent good =
metallic sheens of yellow, pink, turquoise and pale blue are possible =
with an atmosphere created by burning Rosin and by using LPG. =
Temperature is a critical factor as is the Glass Transition Temperature =
of the glaze. So far given theory does not tell us how to determine =
these properties so we guess just as much as the ancients did. As did =
they, we test, observe, record, speculate and start over again.

Best regards,

Ivor Lewis, Redhill, South Australia