platinum in the form of a finely divided black powder, used as a catalyst and absorbent for gases.
| 单词 | θ68823 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > platinum > [noun] > compounds (1) platinum black1850 platinum in the form of a finely divided black powder, used as a catalyst and absorbent for gases. |
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