Usage History of 'darkeners'

The following chart shows how frequently 'darkeners' appeared in printed materials over time. For example, the word 'darkeners' occurred 2 times in books in 1826 and 86 times in 2008. From 1826 to 2008, the word 'darkeners' was used a total of 1,088 times in books scanned by Google. See Reference: Google Ngram project.

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