Quicklime, more formally known as calcium oxide (CaO), is a caustic alkaline substance which is produced by heating limestone in specially designed kilns. There are a wide range of uses for quicklime, ranging from mortar to flux, and the substance has been used by humans for centuries. Many companies produce and sell quicklime, sometimes with specific chemical impurities which make it especially suitable to certain applications.

Quicklime, more formally known as calcium oxide (CaO), is a caustic alkaline substance which is produced by heating limestone in specially designed kilns. There are a wide range of uses for quicklime, ranging from mortar to flux, and the substance has been used by humans for centuries. Many companies produce and sell quicklime, sometimes with specific chemical impurities which make it especially suitable to certain applications.