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|removed their examples. Remodeling and
updating their domiciles was a luxury that few Lowellians could then afford.
Thus, Lowell's economic depression reaped aesthetic benefits, with fancy
glass and other architectural delights that have survived and been preserved.
TRADITIONS AND TECHNIQUES OF STAINED GLASS
Medieval glass artisans discovered that silver nitrate could embellish their work. This "silver stain" is applied as an opaque liquid but becomes yellow-orange when fired. Like vitreous oxides, silver stain fuses to the surface of the glass and is not absorbed. It is from this decorative technique that the term "stained glass" evolved. By the 1600s, glass artists also used bright, multi-colored enamel paints. In the early 1800s mosaic windows were superceded by large pictorial compositions done on single sheets of glass.
Colored glass is painstakingly cut into small pieces and arranged into mosaic patterns on top of a full size charcoal drawing or "cartoon." The small glass pieces are then fired in a kiln so that the vitreous paints became permanently fused to the surface. Next, the mosaic is "leaded up" by setting the glass within a network of lead strips called "cames" which are then soldered together.
DECORATIVE TRADITIONS IN AMERICAN ARCHITECTURAL
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