The object is to create a non stick surface between the pattern and
the mold and to make a non stick surface between mold
halves.........so theoretically most anything that will do that that
is in the form of a dry fine powder or granule and is not readily
combustible would work.....Yes flour and cornstarch etc is able to
burn,. and some things like this will add gas to the cavity and can
result in porosity, but these things do work for the most
part........I know quite a few folks that used wood flour, and
cornstarch at first, but after a period of time their sand smelled
pretty darn bad..........I guess if it puish come to shove and I was
not able to buy any, my first choise would be fine baked sand, or
baby powder followed by diamaceous earth. Just be carefull if using DE
as it is very abrasive and sharp, and is known to irritate eyes if the
dust gets into them........
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