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One other etching agent was developed and exploited to the full during the 19th century. Known as «white acid», it was made by mixing hydrofluoric acid with an alkali, usually carbonate of soda (washing soda). This produced a «frosting acid» that imparted a dense white frost to the surface of glass. Subsequent etchings with dilute hydrofluoric acid produced a range of satin tones. This process is known in the trade as «French embossing» or «triple embossing» and was frequently employed in combination with brilliant cutting.
What do they use for etching the security numbers on car windows - I guess it is pretty nasty stuff,but might be the easiest way. A carborundum (spelling?) grinding/polishing paste would work but be difficult to get uniform