Usage History of 'softeners'

The following chart shows how frequently 'softeners' appeared in printed materials over time. For example, the word 'softeners' occurred 4 times in books in 1748 and 4,140 times in 2008. From 1748 to 2008, the word 'softeners' was used a total of 143,849 times in books scanned by Google. See Reference: Google Ngram project.

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