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Deliberately Colored Glass
In certain deliberately colored glasses
the progress towards disintegration moves quite rapidly. For
example, during weathering of opaque red glass (see Coloration),
the cuprous oxide needles that cause the coloration are easily
converted to a green crust of copper chloride. During the
weathering of "onyx" ware (see Mosaic/Cast),
the creamy opaque white swirls become heavily pitted while
the amber layers between them remain resistant.
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Heavily weathered
"onyx" ware
Early 1st century A.D.
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