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black liquor

noun
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Definition of black liquor

1 : iron liquor
2 : the dark-colored alkaline waste liquor which comes from the sulfate and soda processes of making cellulosic pulp and from which tall oil and lignin are recovered — compare black ash entry 2 sense 2

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“Black liquor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/black%20liquor. Accessed 22 Oct. 2021.

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