Types of Alum

1. Aluminum Sulfate – an odorless, opaque white solid with an acidic, sour taste. It is neither hazardous nor creates residues. It is generally readily soluble and has a fairly high shelf-life.
2. Ammonium Alum – an odorless, clear crystal with an acidic, sour taste. It is neither hazardous nor creates residues. It has a high shelf-life and is readily soluble, especially in water.

Ammonium is added to crystalize and further purify the product. This is beneficial for industries requiring alum with high purity, such as in the production of high-quality paper and baking powder.

Alum is also essential both to our daily lifestyle, such as purifying tap water, and to manufacturing industries such as paper, baking soda, medicines, and material dyeing and bleaching.