WHAT IS POTASSIUM ALUM?
Potassium Alum is an inorganic salt and is also known as Potash Alum or Alum.
USESAstringent, purifying water, coagulent for water treatment, deodorant, food additive.
Our Deodorant Stones are made from Potassium Alum and they create an environment hostile to bacterial growth. In part, this is due to the low pH (4 to 5.3) of the deodorant and perspiration combination.
Also see this Wikipedia entry.