- a superb black dust of metallic platinum, used as a catalyst and also as a gas absorbent.
- a soft, lifeless black colored dust, comprising finely divided metallic platinum acquired by reduction and precipitation from the solutions. It absorbs air to increased degree, and it is used as an oxidizer.
- A black lifeless dust comprising very carefully divided metallic platinum.
- an excellent black powder of platinum; made use of as a catalyst in chemical responses
Hypernym for "platinum black"
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