Usage History of 'litmus'

The following chart shows how frequently 'litmus' appeared in printed materials over time. For example, the word 'litmus' occurred 2 times in books in 1662 and 27,022 times in 2008. From 1662 to 2008, the word 'litmus' was used a total of 724,025 times in books scanned by Google. See Reference: Google Ngram project.

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