Pearl ash

Pearl Ash

Pearl ash is a common term for an impure form of potash, which is in turn an impure form of potassium carbonate. It is a key ingredient in the production of glass, soap, and ceramics.

History

The term "pearl ash" was first used in the late 18th century. It was derived from the method of production which involved baking potash in a kiln and then leaching it, resulting in a product that was white and pearl-like in appearance.

Production

Pearl ash is produced by heating potassium carbonate in a kiln. This process, known as calcination, results in a product that is white and pearl-like in appearance. The resulting product is then leached with water to remove impurities, resulting in a purer form of potash.

Uses

Pearl ash has a wide range of uses. It is a key ingredient in the production of glass, where it acts as a flux, reducing the melting temperature of the raw materials. It is also used in the production of soap, where it acts as a base, reacting with the fatty acids in the soap to form a salt, which is the actual cleaning agent. In ceramics, pearl ash is used as a flux, reducing the firing temperature and improving the properties of the finished product.

Health and Safety

Pearl ash is generally considered safe for use in the amounts typically used in industrial applications. However, it can be harmful if ingested in large amounts, and can cause irritation if it comes into contact with the skin or eyes.

See Also

• Potash
• Potassium carbonate
• Glass production
• Soap making
• Ceramic production