Ponceau

//ˈpɒn.səʊ// noun

Definitions

Noun
  1. 1
    Any of a number of red pigments, some of which are used as indicators.

    "It should be mentioned that considerable divergence exists in the fastness of the various ponceaus, a circumstance still insufficiently known and appreciated in practice."

Etymology

Borrowed from French ponceau.

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