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Webster 1913 Edition

Noun.

Any preparation for making things black; esp. one for giving a black luster to boots and shoes, or to stoves.

The act or process of making black.

ppr.

Making black.

Noun.

A substance used for blacking shoes, variously made; any factitious matter for making things black.

blacking

blacking ‎(usually uncountable, plural blackings)

preparation used to produce a shiny black coating

shoe polish — see shoe polish