Here he is rolling the glass bubble on a steel table (a "marver") to pick up pieces of colored glass. (The glass in the furnace is colorless.) This is the technique that he generally uses for coloring all of his glass.
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Here he is rolling the glass bubble on a steel table (a "marver") to pick up pieces of colored glass. (The glass in the furnace is colorless.) This is the technique that he generally uses for coloring all of his glass.
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