Alum facts for kids
Alum is both a specific chemical compound and a class of chemical compounds.
- Potash alum is potassium aluminum sulfate
- Sodia alum is sodium aluminum sulfate
- Ammonium alum is ammonium aluminum sulfate
Words like "alum" and "potash" were used before modern chemistry developed. The word 'alumen' occurs in Pliny's Natural History (23–79 AD). In the 52nd chapter of his 35th book, he gives a detailed description. Different substances were distinguished by the name of 'alumen', but they were all astringents, and were all used in dyeing and medicine.
Images for kids
Alum crystal with small amount of chrome alum to give a slight violet color
Alum Facts for Kids. Kiddle Encyclopedia.