chrome alum
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- noun [mass noun] a reddish-purple crystalline compound used in solution in photographic processing and as a mordant in dyeing铬明矾, 硫酸铬钾。
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- Chem. formula: K2SO4Cr2(SO4)3·24H2O.化学分子式：K2SO4Cr2(SO4)3·24H2O.