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Paris green

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noun

Chemistry. an emerald-green, poisonous, water-insoluble powder produced from arsenic trioxide and copper acetate: used chiefly as a pigment, insecticide, and wood preservative.
(sometimes lowercase) a variable hue ranging from light to vivid yellow green in color.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of Paris green

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for Paris green

Paris green

noun

an emerald-green poisonous insoluble substance used as a pigment and insecticide. It is a double salt of copper arsenite and copper acetate. Formula: 3Cu(AsO 2) 2 .Cu(C 2 H 3 O 2) 2
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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