The Analysis of Opal and Alabaster Glasses

JSGT 1928 V12 T007-T018

 Speaking generally, opal and alabaster glasses are produced by the addition to the batch, from which the glass is prepared, of one or more constituents which lead to the separation of opaque particles during the cooling of the glass, the degree of opacity depending largely upon the size of the opaque particles produced, the size, in turn, depending to a great extent upon the rate of cooling of the glass.

J. D. Cauwood, J. H. Davidson & Violet Dimbleby