WASHINGTON PAINT TESTS 211 



TABLE 1. ANALYSES OF OILS USED IN THE VEHICLE TESTS 



1 Low constants due to presence of over 40% of volatile matter, largely 

 petroleum spirits. 



2 This oil contained over 20% of petroleum spirits. 



" The pigment formula selected for the tests had the following 

 composition: 



Basic carbonate-white lead 20% 



Sublimed white lead 30% 



Zinc oxide 35% 



Magnesium silicate 10% 



Barytes 5% 



100 Ibs. of pigment base ground to a stiff paste in 16 Ibs. of linseed oil. 



"While this pigment formula was not selected as being superior 

 to certain other formulas, it is of a type that has given very fair 

 service in paint tests throughout the country, and will no doubt 

 serve admirably for the purpose designed in these tests. 



" The vehicle formulas in the finished paints are as follows: 



No. 1 

 Raw linseed oil 100% 



No. 2 1 

 Soya bean oil 100% 



No. 3 2 



No. 4 



Raw linseed oil 



Boiled linseed oil (resinate) 



25% 

 75% 



No. 5 



Raw linseed oil 25% 



Boiled linseed oil (linoleate) . . 75% 



No. 6 



Raw linseed oil 50% 



Boiled linseed oil (resinate) ... 50% 



No. 7 



Raw linseed oil 50% 



Boiled linseed oil (linoleate) ... 50% 



1 Dry pigment formula in soya bean oil. 



2 Dry pigment formula in menhaden oil. 



