Usage History of 'photochromic'

The following chart shows how frequently 'photochromic' appeared in printed materials over time. For example, the word 'photochromic' occurred 4 times in books in 1874 and 995 times in 2008. From 1874 to 2008, the word 'photochromic' was used a total of 73,501 times in books scanned by Google. See Reference: Google Ngram project.

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