: a substance (such as a paste or polish) that is applied to an object to make it black
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“Blacking.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blacking. Accessed 5 Jul. 2026.
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blacking
noun
black·ing
ˈblak-iŋ 
: a substance (as a paste or polish) that is applied to an object to make it black
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