Wurster's salt
noun
Wur·ster's salt
| \ ˈwər|stərz-, ˈwu̇(r)|, ˈvu̇r|\
Definition of Wurster's salt
: any of several deeply colored semiquinones formed by partial oxidation (as with bromine) of the conjugate acid of para-phenylenediamine or its N-alkyl derivatives: such as
a
or Wurster's red
or Wurster's red salt
: a red product made from N,N-dimethyl-para-phenylenediamine
b
or Wurster's blue
or Wurster's blue salt
: a blue product made from tetramethyl-para-phenylenediamine
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