Dave Evans on wed 17 jan 01
I've been thinking of using some potassium carbonate to pin down some =
K/Na relationships, and after searching the archives I understand the =
caustic nature of the substance. I assume it is also quite soluble. My =
question regards the nature of this stuff in the bucket. Does it =
crystallize out like soda ash? Is it tough to blend into the mix? Any =
info from those in the know would be appreciated. =20
Thanks,
John Evans in San Diego
Louis Katz on thu 18 jan 01
Unfortunately if you glaze a pot with a glaze containing soluble compounds you will end up with a coating that has more soluble compound on the surface than on the inside, and some of the soluble compound will end up in the walls of the pot or test tile. How much material ends up on different parts of the surface depends on a great number of factors. Here is a list of some of the factors:
temperature of the glaze slurry
air temperature
wind speed as the mixture dries
how long it sits before it is fired
how much hydroscopic material is in the glaze slurry
the humidity in the room
I think it would be great to pursue these tests, but it might be necessary to frit the materials first to get meaningful results.
Louis
John Evans wrote:
> I've been thinking of using some potassium carbonate to pin down some K/Na relationships, a..... I assume it is also quite soluble. My question regards the nature of this stuff in the bucket. Does it crystallize out like soda ash? Is it tough to blend into the mix? Any info from those in the know would be appreciated.
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