iandol on wed 18 dec 02
Dear Linda Knapp=20
Before I could answer your question I would wish to know what sort of =
Crystals you intended making and then, just how far are you willing to =
compromise in adjusting your current firing program.
Best regards,
Ivor Lewis.
iandol on sat 21 dec 02
Dear John Weber,
If you are intending to make Zinc Silicate Crystal Glazes then heavy =
reduction will convert your zinc oxide into metallic Zinc which has a =
boiling point of just over 900 degrees Celsius. As it may take several =
hours for your kiln to climb from that point to 1300 Celsius we might =
conclude that there will be very little zinc remaining in solution to =
form silicate crystals. However, this may not be your intention, you may =
be intending to make Copper Silicate Crystals.
The post maturity reduction I suggested might give you silver crystals =
against a Red ground. I think this would be spectacular.
There has been a lot of discussion about the emphemerality of Zinc oxide =
in Reduction firings and the need to maintain an oxidising atmosphere.
Best regards,
Ivor Lewis.
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