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PAINT TECHNOLOGY AND TESTS 



chrome yellow, lampblack, iron oxide, etc., have shown on the 

 other field tests which have been conducted at Atlantic City, 

 Pittsburg, and Fargo the value of these pigments in giving to 

 the paints increased wearing properties. On the Southern Test 

 Fence, therefore, all the formulas were ground in white only and 

 placed upon white pine so as to make the test primarily one to de- 

 termine the value of the various white pigments upon good wood. 

 Oil and Thinner Tests. Upon one series of panels on the fence 

 was placed one of the formulas which had given universal satis- 

 faction on the various test fences in the past, and this formula 

 was made up with various oils other than linseed oil, in order to 



Tennessee Test Fences 



determine the value of these oils as painting materials. For 

 instance, the vehicle part of the one formula referred to is made 

 up of 50% linseed oil and 50% soya bean oil, and again 50% 

 linseed oil and 50% rosin oil, etc., an effort being made to test 

 out a few of the available semi-drying oils. 



The same formula referred to was ground in pure linseed oil 

 and subjected to a series of tests where it has been thinned for 

 application as priming and second coats with a series of wood 

 turpentines obtained from the United States Forest Products 

 Laboratory at Madison, Wis. These turpentines were made 

 from southern pine stumps and sawdust, and they vary greatly 

 in their properties. Some were objectionable in odor, while 

 others were of excellent quality, having an odor almost equal 

 to that of pure gum spirits. 



