Usage History of 'blackener'

The following chart shows how frequently 'blackener' appeared in printed materials over time. For example, the word 'blackener' occurred 2 times in books in 1769 and 154 times in 2008. From 1769 to 2008, the word 'blackener' was used a total of 1,424 times in books scanned by Google. See Reference: Google Ngram project.

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