Red liquor

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Related to Red liquor: sulfite pulp
(Dyeing) a solution consisting essentially of aluminium acetate, used as a mordant in the fixation of dyestuffs on vegetable fiber; - so called because used originally for red dyestuffs. Called also red mordant.

See also: Red

References in classic literature ?
And raising the foot of the bed, he drew out the phial, still a third filled with the red liquor.
Keemun, a traditional tea of old Imperial China, is famous for its orchid aroma and brilliant red liquor.