

Aluminium Potassium Sulfate Dodecahydrate by Molecular Depot is a aluminium potassium sulfate dodecahydrate, known as potash alum, of 99.5 per cent purity. Alum hydrolyses in water to give aluminium hydroxide and an acidic solution, and that combination is what makes it a mordant: the metal binds both the tissue and the dye and holds them together. It is used as a mordant in haematoxylin staining solutions, as an astringent and precipitant in formulation research and as a reference salt. Each unit contains 50 g. MBP supplies Molecular Depot research reagents to research labs in the United States, Canada and worldwide.