1lb resealable bag of alum. Potassium aluminium sulfate, or potash alum, or potassium alum, is achemical compound. Its chemical formula is KAl(SO4)2. It contains potassium,aluminium, and sulfate ions. *DISCLAIMER* THIS PRODUCT DOES NOT MEET PPPA REQUIREMENTS AND IS INTENDED FOR INDUSTRIAL AND MANUFACTURING USES ONLY AND IS NOT INTENDED FOR USE IN AREAS WHERE CHILDREN ARE PRESENT.