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  • abrasive Powder used to produce a smooth optical surface through abrasive polishing. Compounds may produce a surface finish specified for each.
  • polishing The optical process, following grinding, that puts a highly finished, smooth and apparently amorphous surface on a lens or a mirror.
  • polishing and abrasive material Any of the numerous powders used for grinding and polishing glass, crystal or metal, the chief material being emery and carborundum for grinding, and rouge or the oxides of tin, cerium or other metals for polishing.
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