platinum black

noun Chemistry.
  1. a black powder consisting of very finely divided metallic platinum, used as a catalyst, especially in organic synthesis.

Origin of platinum black

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for platinum black

platinum black

noun
  1. chem a black powder consisting of very finely divided platinum metal. It is used as a catalyst, esp in hydrogenation reactions
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