| 单词 | chrome alum |
| 释义 | chrome alumnoun : an alum in which chromium is the trivalent metal especially : potassium chromium sulfate KCr(SO4)2.12H2O obtained as dark purple crystals by treating potassium dichromate with sulfur dioxide and used in tanning, as a mordant, and as a hardening agent for gelatin in photography |
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