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THE CAUSE AND PREVENTION OF CERTAIN BROWN STAINS ON SEMIVITREOUS TABLEWARE 1
Author(s) -
Loomis G. A.
Publication year - 1930
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1930.tb16242.x
Subject(s) - kiln , atmosphere (unit) , reducing atmosphere , mineralogy , chemistry , metallurgy , reduction (mathematics) , environmental science , environmental chemistry , materials science , meteorology , physics , mathematics , geometry
It has been found that the brown stains formed on ware bedded in sand in the bisque fire are due to a reduction of iron in the sand. This reduction is apparently due to insufficient air in the saggers during oxidation of the ware when the kiln atmosphere is low in excess air. Firing the ware in saggers with holes to allow a circulation of air prevented the stains. The ware may also be fired in closed saggers without these defects by admitting sufficient excess air to the kiln and allowing more time at low oxidation temperatures.