gray sour
noun
1
: treatment (as of cotton) with dilute hydrochloric or sulfuric acid after scouring and before bleaching
2
: the bath or solution used in the gray sour
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“Gray sour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gray%20sour. Accessed 26 Nov. 2024.
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