Soluble Salts
FORESIGHT defines a related test it abbreviates ‘SOLU’. This test deals with the
measurement of the incidence of soluble salts in clay bodies and materials. This test
employs the specimens made for the DFAC test. You can find information elsewhere here
on the theory of what soluble salts are (see article on use of barium carbonate in clay
bodies), their potentially detrimental effects and how this test can be performed with simple
equipment. Soluble salt surface depositing (or efflorescence) is a phenomenon not
understood my many ceramists but one that will one day make itself known to you if it has
not already done so. It is something that can affect any type of clay body, from porcelain to
brick clay (the brick industry knows all about it!).
Soluble Salts
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