110. Lime-washing is a much more effectual mode of purification than white-washing, but is not so often used, as few persons know how to make lime-wash. If glue is used, it is destroyed by the lime, and the wash easily rubs off the walls when dry. This also happens if the lime be simply slaked in water and used without any fixing material. Lime-wash should be made by placing some freshly-burned quick-lime in a pail, and pouring on sufficient water to cover it; if the lime is fresh, great heat is given out; boiled oil (a preparation of linseed oil, sold by all oilmen) should then be added, one pint to each gallon of wash. For cheapness, any refuse fat, such as dripping may be used instead of the boiled oil. The whole should then be thinned with water. The brush should not be left in the lime-wash or the bristles will be destroyed. Should coloured washed be required, one pound of green vitriol added to every two gallons of wash gives a very pleasing drab.
Quick-lime slaked with skimmed milk, and after-wards thinned with water, makes an excellent wash for out-door walls, as it is not acted on by the weather.
Lime-washing is strongly recommended as a means