Usage History of 'discolouring'

The following chart shows how frequently 'discolouring' appeared in printed materials over time. For example, the word 'discolouring' occurred 4 times in books in 1664 and 1,054 times in 2008. From 1664 to 2008, the word 'discolouring' was used a total of 20,512 times in books scanned by Google. See Reference: Google Ngram project.

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