5 14 IOWA DEPARTMENT OF AGRICULTURE 



Composition and cost of tinted and colored paints. 



For dark shades of brown or red there is probably nothing which is as 

 cheap as the oxid of iron pigments. These vary very much in shade, giving 

 both browns and dull reds. A pigment that gives a very satisfactory red- 

 dish brown and contains about 40 per cent of iron oxid makes a satis- 

 factory paint containing approximately 56 per cent pigment and 44 per 

 cent vehicle, the vehicle being very much the same as that used in a first- 

 class white paint. Such a paint will weigh about 13.5 pounds to the gallon,, 

 which, therefore, will contain 7.56 pounds of pigment and 5.94 pounds of 

 vehicle. This pigment is cheap, generally costing not more than 1 or 1% 

 cents per pound. The pigment in a gallon of this paint, therefore, would 

 cost aproximately 10 cents, and the 5.94 pounds of vehicle about 73 cents, 

 giving a cost of 83 cents for the gallon of paint. 



An inspection of these figures shows that the expensive part of this paint 

 is the vehicle and not the pigment. A paint of this character is a very 

 good material to apply either to wood or iron. There are more expensive 

 paints, however, frequently used on iron to protect it from rusting, the 

 most popular being red lead and linseed oil. This material undoubtedly 

 affords very good protection, but it is also expensive. A red-lead paint can 

 not be made and kept as most other paints can. The red lead itself 



oBone black; tuscan red; ultramarine blue. 



6 Umber and ocher. 



c Golden ocher. 



(/Ocher and bone black. 



c Prussian blue. 



/ ISone black; Venetian red; chrome yellow. 



fl'Para-red. 



ft Five-sixths chrome yellow, one-sixth Prussian blue. 



i Carbon, 



