ANALYSIS, EEFINING, AND COMPOSITION. G7 



No. 1: This is next in quality to No. 4 and No. 5. 



No. 3. This is the least desirable of the lot, having very disagreeable odor 

 and being very dark in color. It also forms considerable residue when distilled 

 with steam. 



From a commercial point of view, we believe that No. 2 could be used to a 

 considerable extent in the paint and varnish industries in place of gum spirits. 

 but the odor of all the others would prevent their use except in a very small 

 way. 



REPORT 6. 



(BY NAVY DEPARTMENT.) 



(1) Tests have been concluded on four samples of wood turpentine (5 gal- 

 lons each) submitted for testing purposes by the Director, United States De- 

 partment of Agriculture, Forest Service, Forest Products Laboratory, Madison, 

 Wla 



(2) Results of physical tests: 



The sample turpentines were marked Nos. 2, 3, 4, and 5, and were utilized 

 in place of pure spirits of turpentine in four paints mixed according to the fol- 

 lowing formulas, each paint, being mixed with a different turpentine sample. 



Parts 

 by weight. 



White lead 9 



White zinc 5 



Lampblack in oil ' \ 



Raw linseed oil 3| 



Test turpentine \ 



Japan drier \ 



A similar number of paints (four) were mixed according to the above for- 

 mula, using, however, pure spirits of turpentine instead of the test materials. 

 These paints were considered as standards against which the paints containing 

 the sample turpentines were to be tested. The paints were applied for the 

 foregoing purpose to steel plates, and after the paints had dried the plates were 

 exposed to the weather under date of October 12, 1911. 



(3) It was noted that the paints containing the samples Nos. 2, 4, and 5 dried 

 out in about the same time as the standard paints, while the No. 3 sample 

 paint seemed to dry somewhat slower than the others. The plates were taken 

 down for examination July 28, 1912, when it was found that the paints contain- 

 ing the sample turpentines were in excellent condition and quite equal to the 

 standard paints in every respect. 



(4) A second batch of paints were made up to practically the same formulas 

 as previously used, with the exception that one half of the linseed oil was re- 

 placed with blown fish oil. These paints were applied on steel plates as be- 

 fore and were exposed October 16, 1911, to the weather in comparison to 

 standard paints. These standard paints were mixed according to the same 

 formula as the test turpentine paints, with the exception that pure spirits of 

 turpentine was used. When examined July 29, 1912, it was found that all of 

 the paints were in good condition, being about the same as the first batch of 

 paints which were made up. It was noted that the fish-oil paints dried much 

 slower than the first series of paints, which were made up with the linseed oil, 

 the No. 3 sample paint being the last of the second series to dry. 



(5) A third series of paints were now made up according to the following 

 formulas, standard paints being also made up for comparison (pure spirits of 

 turpentine) : 



Parts 

 by weight. 



White lead (dry) 40 



Sublimed white lead (dry) 60 



Zinc oxide (dry) 70 



Asbestine (dry) 20 



Barytes (dry) 10 



Linseed oil 32 



Toch drier 0.3 



Test turpentine 50 



Parts 

 by weight. 



White lead (dry) _ 40 



Sublimed white lead (dry) 60 



Zinc oxide (dry) 70 



Asbestine (dry) 20 



Barytes (dry) 10 



Linseed oil 50 



Toch drier 0.3 



Test turpentine 32 



