Incombustible Wash for Walls.
Slack stone lime in a large tub or barrel with boiling hot water, says The National Builder, covering the tub or barrel to keep in all the steam. When thus slaked, pass six quarts of it through a fine sieve. It will then be in a state of fine flour. Now, to six quarts of this lime add one quart of rock salt and one gallon of water; then boil the mixture and skim it clean. To every five gallons of this skimmed mixture, add one pound of alum, half a pound of copperas, by slow degrees, and three-fourths of a pound of potash and four quarts of fine sand or hickory ashes sifted. We suppose any kind of good hardwood ashes will answer as well as hickory. This mixture will now admit of any coloring matter you wish, and may be applied with a brush. It looks better than paint and is as durable as slate. It will stop small leaks in a roof, prevent the moss from growing over and rotting the wood and render it incombustible from sparks falling upon it. ’ When laid upon brick work it renders the brick impervious to rain or wet.