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Lime is a material used for example in construction as a binder to make mortar as altenative to cement.

There are two forms of lime: quicklime and hydrated lime.

Quicklime is produced by heating rock or stone containing calcium carbonate (limestone, marble, chalk, shells, etc.) to a temperature of around 1000°C for several hours in a process known as 'calcining' or sometimes simply 'burning'. It is an unstable and slightly hazardous product and therefore is normally hydrated or 'slaked', by adding water, becoming not only more stable but also easier and safer to handle.