1. Chrome alum

2. Chrome alum Crystals are deep purple in color

3. 300 grams potassium chromium sulfate (chrome alum) 500 ml boiling water; The solution will be too dark to observe Crystal

4. Alizarin >> Chrome alum, K 2 SO 4 �Cr 2 (SO 4) 3.24H 2 O, appears chiefly as a by-product in the manufacture of Alizarin, and as a product of the reaction in bichromate batteries