medelman@facstaff.wisc.edu on tue 18 jun 96
Sharon Palmatory is seeking Coleman's crawl glaze, which he terms "Mudcrack
glaze".
I have the answer, which is in Piepenburg's latest book: "The Spirit of
Clay". (see p. 126 if you can get hold of it.)
I quote: The piece was first glaze fired to cone 5; re-glazed with a thick
application of his "Mud Crack"
overglaze (50 % magnesium carbonate, 20 % neph. syenite, 20% Ferro Frit
3134, and 10% Gerstley borate) and fired to cone 3.
My suggestions are: try over a matte surface glaze. You mentioned a slip.
I think it would have to be a very vitreous slip to work. Depending on your
kiln, I have had better luck with a cone 2 in the sitter. or witness cone 3
at 9 oclock.. But all depends on the glaze underneath. Also, thick
application means THICK or the texture is absorbed into the glaze. If
spraying the mudcrack glaze, it is possible that it will crack and fall off
the existing fired glaze!!.
Good luck and I would like to hear how you did it if you get good results.
Bacia Edelman medelman@facstaff.wisc.edu
from Madison, WI where I have never seen so much heavy rain and flooding in
May and June in my life.
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