| Definition of 'platinum black' |
Princeton's WordNet |
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1. (noun) platinum black
a fine black powder of platinum; used as a catalyst in chemical reactions
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| Definition of 'platinum black' |
The Standard Electrical Dictionary |
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1. platinum black
Finely divided platinum. It is made by boiling a solution of platinic chloride with excess of sodium carbonate and a quantity of sugar, until the precipitate is perfectly black and the supernatant liquid is colorless. It seems to possess a great power of occluding oxygen gas. When heated to redness it becomes spongy platinum. The negative plates of a Smee battery are coated with platinum black.
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Definitions of platinum black 
