Usage History of 'benzidine'

The following chart shows how frequently 'benzidine' appeared in printed materials over time. For example, the word 'benzidine' occurred 2 times in books in 1842 and 2,119 times in 2008. From 1842 to 2008, the word 'benzidine' was used a total of 159,410 times in books scanned by Google. See Reference: Google Ngram project.

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