Opalescent glass is a generalized term for clear and semi-opaque pressed glass, cloudy, marbled, and sometimes accented with subtle coloring all combining to form a milky opalescence in the glass. John LaFarge and Louis Comfort Tiffany first experimented with opalescent effects, driven by their desire to use glass in creating beautiful visual scenes in stained glass without painting. Opalescence is also created during the glassmaking process by alternating heating and cooling of the glass and with the addition of chemical additives to create the desired effect. Opalescent glass was manufactured by Tiffany Studios, Lalique, Sabino, and other European glassmakers.
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