Usage History of 'photonegative'

The following chart shows how frequently 'photonegative' appeared in printed materials over time. For example, the word 'photonegative' occurred 8 times in books in 1895 and 75 times in 2008. From 1895 to 2008, the word 'photonegative' was used a total of 7,508 times in books scanned by Google. See Reference: Google Ngram project.

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