A formula used by the United States Government in making whitewash for light-houses and other public buildings is as follows:
Unslaked lime....... 2 pecks
Common salt........ 1 peck
Rice flour........... 3 pounds
Spanish whiting...... 0.5 pound
Glue (clean and white)............ 1 pound
Water, a sufficient quantity.
Slake the lime in a vessel of about 10 gallons capacity; cover it, strain, and add the salt previously dissolved in warm water. Boil the rice flour in water; soak the glue in water and dissolve on a water bath, and add both, together with the whiting and 5 gallons of hot water to the mixture, stirring all well together. Cover to protect from dirt, and let it stand for a few days, when it will be ready for use. It is to be applied hot, and for that reason should be used from a kettle over a portable furnace.