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单词 chrome alum
释义

chrome alum

noun

: 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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更新时间:2026/6/3 10:29:26