Usage History of 'thionine'

The following chart shows how frequently 'thionine' appeared in printed materials over time. For example, the word 'thionine' occurred 11 times in books in 1889 and 220 times in 2008. From 1889 to 2008, the word 'thionine' was used a total of 19,423 times in books scanned by Google. See Reference: Google Ngram project.

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