Turnbull's blue

noun
Turn·​bull's blue | \ ˈtərnˌbu̇lz-\

Definition of Turnbull's blue

: an iron blue pigment having a coppery luster formed as a precipitate when an alkali metal ferricyanide and a ferrous salt are brought together in solution and formerly regarded as ferrous ferricyanide — compare prussian blue

History and Etymology for Turnbull's blue

probably from the name Turnbull

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