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ZINC‐VAPOR GLAZING OF CLAYS: II, EFFECT OF VARIABLE LIME AND ALKALIS IN CLAYS ON ZINC‐VAPOR GLAZE COLORS *
Author(s) -
Lampman C. Major,
Schurecht H. G.
Publication year - 1940
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.1151-2916.1940.tb14230.x
Subject(s) - lime , glaze , zinc , oxidizing agent , mineralogy , brick , chemistry , metallurgy , materials science , composite material , ceramic , organic chemistry
A bstract A study was made of the influence of the lime content of brick on their ability to take zinc‐green, yellow, tan, and brown glazes. Desirable greens were obtained with clays containing as much as 3% lime; those with a higher percentage of lime generally produced yellow‐greens. The probability of obtaining good greens was best on clays with more than 6% of alkalis when their absorptions after firing were below 2%. Desirable greens were not obtained on bodies which had absorptions greater than 6.7%. Firing under oxidizing conditions before flashing and slow cooling tended to promote the formation of desirable brown, tan, and straw‐colored zinc‐vapor glazes.