
1) Polish 2) Shoe polish
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https://www.crosswordclues.com/clue/blacking

shoe or boot polish. As a child Dickens was employed at Warren's Blacking factory.
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http://charlesdickenspage.com/glossary.html

• (n.) Any preparation for making things black; esp. one for giving a black luster to boots and shoes, or to stoves. • (p. pr. & vb. n.) of Black • (n.) The act or process of making black.
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http://thinkexist.com/dictionary/meaning/blacking/

A rust-resisting treatment applied to guns or armour, using either chemicals or paint.
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http://www.antique-marks.com/antique-terms-b.html

A rust-resisting treatment applied to guns or armour, using either chemicals or paint.
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http://www.encyclo.co.uk/visitor-contributions.php
Black'ing noun 1. Any preparation for making things black; esp. one for giving a black luster to boots and shoes, or to stoves.
2. The act or process of making black.
Found on
http://www.encyclo.co.uk/webster/B/61

Blacking was an early form of polish for boots and shoes. Victorian blacking usually contained for its principal ingredients oil, vinegar, ivory or bone black, sugar or molasses, strong sulphuric acid, and sometimes caoutchouc and gum-arabic. It was used either in liquid or in the form of paste, the only difference being that in making the paste a ...
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http://www.probertencyclopaedia.com/browse/PB.HTM

In an industrial dispute, the refusal of workers to handle particular goods or equipment, or to work with particular people
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https://www.encyclo.co.uk/local/21221

any preparation for producing a black coating or finish, as on shoes or stoves.
Found on
https://www.infoplease.com/dictionary/blacking
No exact match found.