Laura Conley on tue 7 apr 98
Two food safety glaze questions that I have not seen addressed are:
1) iron spots - do the iron spots that pop through some reduction fired glazes
leach in acids?
2) crystalline glazes - are these food safe? I suspect they may not be soap saf
since they have so little alumina, but what about the crystals - do they leach i
acid, or once again is every glaze different?
TIA
Laura Conley (posssibly about to put an iron spotting glaze on some plates...)
Boulder, CO
Gay Judson on wed 10 oct 07
1) I am using a glaze I mixed up a LARGE quantity about 2 years ago. It
originally gave a wonderful variegated green/blue/brown based on thickness.
Now I generally only get dark blue. I stir and strain the whole batch
before each use. But can some of the colorants have left the glaze leaving
behind only the cobalt?
2) I have a nice green glaze. In the most recent firing the bowls have a
slightly hazy (or milky) look inside the bowl, especially in the center
where thicker. Does that indicate that the glaze is not being fired high
enough? These pieces were not on the very bottom of the kiln (where it did
not reach a true ^6) but they were not at the top either. This is a new
batch of the glaze but I have fired it once before and did not have the hazy
look.
I love the glazes Judy Musicant offered: Green Breaking Brown and Bronze
Satin Matt (may have the name wrong). Not easy to work with--did not like
my first try with them--but loved them on the next run through. I don't
like Amy's Vlue Violet--for me it is a strong baby blue.
Gay Judson
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