MIXING PAINTS. 460 



may be used in all kinds of paints, except greens and very 

 delicate colors. White Vitriol or Copperas. This turns 

 into water, especially when used in black paints ; and is 

 almost useless for any color till the water of crystallization 

 is evaporated, and then it becomes a powerful drier, and 

 may be used for every delicate color, as it is perfectly trans- 

 parent ; but when used in its raw state in white paint, has 

 the effect of turning it yellow. Sugar of Lead. This is 

 a very useful and transparent drier, not so powerful as 

 white vitriol, but it may be used with it to advantage. 



Milk Paint for In-door Work. The quantity for one 

 hundred square feet : One quart of skimmed milk, three 

 ounces of lime, two ounces of linseed or poppy oil, one 

 pound and a half of Spanish white or whiting. Put the 

 lime into a clean bucket, add sufficient of the milk to slake 

 the lime, add the oil a few drops at a time, stirring the 

 mixture with a flat stick till the whole of the oil is incorpo- 

 rated in the mass ; then add the remainder of the milk, 

 and afterwards the Spanish white or whiting, finely pow- 

 dered, and sifted gently over the mixture by degrees. 

 Curded milk will do for the purpose, but it must not be 

 sour. One coat of this will do for ceilings and staircases 

 in general ; two coats or more for new wood. Where color 

 is required, you may use powdered umber, ochres, chromes, 

 greens, blues, pinks, &c., &c., ground in milk. For particu- 

 lar work, strain the color through a hair sieve. 



Lime Whitewash. Lime whitewash is made from lime 



