| 单词 | platinum black |
| 释义 | > as lemmasplatinum black platinum black n. platinum in the form of a finely divided black powder, used as a catalyst and absorbent for gases. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > platinum > [noun] > compounds platinum black1850 1850 Philos. Trans. (Royal Soc.) 140 779 A small portion of finely-divided platinum (prepared from platinum-black by ignition). 1878 W. de W. Abney Treat. Photogr. (1881) 157 The prints produced by this [platinum] process are exceedingly beautiful, and, as platinum black forms the image, they may be considered as being far more permanent than a silver print. 1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) xxvii. 1331 Platinum black..is a velvety-black powder obtained by adding ethanol to a solution of PtCl2 in aqueous KOH and warming. < as lemmas |
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