Lime, which possesses many advantages over the older Lump Lime. The art of using lime is one of the very oldest connected with the building trade and was probably brought to its greatest perfection by the Greeks and Romans. Since these ancient times until very recently little or no improvement has been introduced in the preparation of plaster or stucco made from lime. Probably the reason for this is the time and care required to slake the lump lime used to prepare the mortar. With the use of hydrated lime the time required to slake and age the quick lime is done away with.