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Aluminium potassium Sulphate AR 500g* Aluminium potassium sulphate (also known as potash alum or potassium alum) is primarily used as a coagulant or flocculant in water purification experiments, as a mordant in dyeing processes, and for preparing specific staining solutions in histology, particularly when staining lung or muscle tissue sections; due to its astringent properties, it can also be used in some cosmetic applications like styptic pencils to stop minor bleeding. Key points about Aluminium potassium sulphate AR: Chemical formula: KAl(SO4)2 Common name: Alum Typical form: Dodecahydrate (KAl(SO4)2 * 12H2O) Applications in a lab: Water treatment: Used to clarify water by causing suspended particles to clump together and settle out. Dyeing: Acts as a mordant to fix dyes to fabric fibers Histology: Used in preparing Mayer’s hematoxylin solution for staining tissue sections, particularly lung tissue Crystallization experiments: Can be used to grow large, clear crystals for demonstration purposes