Usage History of 'phthaleins'

The following chart shows how frequently 'phthaleins' appeared in printed materials over time. For example, the word 'phthaleins' occurred 21 times in books in 1877 and 66 times in 2008. From 1877 to 2008, the word 'phthaleins' was used a total of 4,603 times in books scanned by Google. See Reference: Google Ngram project.

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