ANALYSIS, REFINING, AND COMPOSITION. 



65 



No. 3 is too disagreeable in sinell to be used, except in small proportions. The 

 choice therefore lies between No. 2 and No. 5, with the majority of points in 

 favor of the latter. 



REPORT 4. 



VARNISH TESTS MADE WITH WOOD TURPENTINES SUBMITTED BY UNITED STATES 

 FOREST PRODUCTS LABORATORY. 



Two grades of varnish were made up from each of the wood turpentines 

 rubbing varnish and spar varnish. The formulas used throughout in making up 

 these varnishes are as follows : 



RUBBING VARNISH. 



SPAR VARNISH. 



In the manufacture of the varnishes it was noted that Nos. 2 and 4 had the 

 best odor while Nos. 1, 3, and 5, under heat, gave off strong odors, somewhat 

 irritating to the eyes. By heating up the various turpentines alone to 100 and 

 observing the odor the same result was obtained. 



The varnishes which were manufactured from these turpentines were applied 

 to oak panels 6 inches wide 12 inches high and 1 inch thick. After the panels 

 had been properly coated, they were subjected to a series of tests, and the data 

 obtained from these tests are also recorded in the following charts. 



EXTERIOR VARNISH. 



iA, B, C, and D indicate degrees of darkness, A being darkest and D lightest. 



