James L Bowen on thu 17 feb 00
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An important thing to findout about these ingredients is how they will work =
for
you or against you. A potter friend related how a raku body containing
California fireclay contained a small amount of calcium, normally not a =
problem
in high fire work but disasterous in raku. He lost virtually an entire =
years
production to calcium pops many pots after they had been in the customers =
home
for many months. When he had a clay body formulated with Missouri fireclays=
the
problems ceased.
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