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Updated: May 17, 2025
The seed-lac is bleached by boiling with sodium or potassium carbonate, alum, or borax, and then, if it is not pale enough, is further bleached by exposure to sunlight. After further operations of melting and straining, the lac is melted and spread into thin sheets to form ordinary shellac, or is melted and dropped on to a smooth surface to form "button-lac."
Ordinary shellac almost invariably contains some rosin, but good button-lac is free from this substance. The presence of 5 per cent. of rosin in shellac can be detected by dissolving in a little alcohol, pouring the solution into water, and drying the fine impalpable powder which separates.
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