Alum For Hairfall What Are Other Names For Potash Of Alum And Where Can I Buy It For An Elementary Science Project?

What are other names for Potash of Alum and where can I buy it for an elementary science project? - alum for hairfall

My daughter has, crystals of potassium alum-form, but nobody seems to know what it is or take. Spice is an alum, you can find grogery in the store?