516 IOWA DEPARTMENT OF AGRICULTURE 



(3) Two gallons skimmed milk. 



Pour (2) into (1), then add the milk (3) and mix thoroughly. 

 Lighthouse whitewash. (1) Sixty-two pounds (1 bushel) quicklime, 

 slake with 12 gallons of hot water. 



(2) Twelve pounds rock salt, dissolve in 6 gallons of boiling water. 



(3) Six pounds Portland cement. 

 Four (2) into (1) and then add (3). 



Note. — Alum added to a lime whitewash prevents it rubbing off. An 

 ounce to the gallon is suflBcient. 



Flour paste answers the same purpose, but needs zinc sulphate as a 

 preservative. 



Molasses renders the lime more soluble and causes it to penetrate the 

 wood or plaster surface; a pint of molasses to 5 gallons of whitewash is 

 sufficient. 



Silicate of soda solution (about 35° Baume) in the proportion of 1 to 

 10 of whitewash produces a fireproof cement. 



A pound of cheap bar soap dissolved in a gallon of boiling water ana 

 added to about 5 gallons of thick whitewash will give it a gloss like oil 

 paint. 



An old receipt for whitewash, issued by the Lighthouse Board of the 

 Treasury Department, said to be very good for outdoor exposure, is as 

 follows: 



Slake half a bushel of unslaked lime with boiling water, keeping it 

 covered during the process. Strain it and add a peck of salt, di'ssolved 

 in warm water; three pounds of ground rice put in boiling water and 

 boiled to a thin paste; half a pound of powdered Spanish whiting and 

 a pound of clear glue, dissolved in warm water; mix these well together 

 and let the mixture stand for several days. Keep the wash thus prepared 

 in a kettle or portable furnace; and when used, put it on as hot at pos- 

 sible, with painters' whitewash brushes. 



The washes which contain milk, flour, or glue are not to be advised for 

 use in damp, interior places, owing to danger of decomposition of the or- 

 ganic matter. For such locations it is better to use one of the formulae con- 

 taining none of these ingredients. Whitewash is applied with a broad 

 whitewash brush and is spread lightly over the surface, no attempt being 

 made to brush it in as is the case with an oil paint. 



CALCIMINE. 



Cold water paints or calcimine have as their basis whiting or carbonate 

 of lime instead of caustic lime, as in whitewash. This material itself 

 does not adhere, and it is necessary to use a binder of some kind, generally 

 glue or casein. Scott also gives the following directions for making calci- 

 mine: 



Ordinary white stock. (Calcimine): (1) Sixteen pounds of dry Paris 

 white (whiting) mixed until free of lumps, with 1 gallon boiling water. 



(2) One-half pound white sizinz glue; soak 4 hours in one-eighth gallon 

 cold water. Dissolve on a water-bath (gluepot) and pour into (1). 



The above recipe makes about 2 gallons of stock, weighing 12% pounds 

 per gallon. It is of proper brush consistency and may be used at once, 



