red liquor
noun
1
a
: the mother liquor left in the evaporation of the solution obtained by leaching black ash in the Leblanc process
b
: the mother liquor obtained in the recrystallization of tartar
2
or less commonly red mordant
: a solution consisting essentially of an aluminum acetate used in making red color lakes and as a mordant especially in dyeing red
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Merriam-Webster unabridged
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