66 



WOOD TURPENTINES. 

 RUBBING VARNISH. 



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

 Temperatureof laboratory during application of varnish: A coat, 90.5 F.; B coat, 93.2 F.; C coat, 86 F. 



PAINT TESTS WITH WOOD TUBPENTINES. 



After the varnish test had been finished, the various turpentines were used 

 to thin one standard paint formula, and this paint formula was applied to a 

 series of panels to be placed on the southern test fence. The formula selected 

 for the test consisted of 45 parts corroded white lead, 45 parts zinc oxide, 5 

 parts of asbestine, and 5 parts of whiting. This paint was divided into portions 

 and thinned respectively with the five turpentines submitted for test. The 

 paint formula itself was made up in condition resembling a ready mixed paint, 

 as found upon the market, but containing nothing in the vehicle portion except 

 linseed oil and drier. This formula was thinned in the proportion of 1 pint of 

 turpentine to a gallon of paint for the priming coat, and one-half pint turpen- 

 tine and one half gallon linseed oil for the second coat. The third coat was used 

 without reduction. During the application of these paints the painter noted that 

 No. 3 had a very objectionable odor, while Nos. 1, 2, and 4 had a very good odor. 

 No. 2 probably being the best. In working and flatting properties, Nos. 1, 2, 4, 

 and 5 gave the, best results, and fully as good results as with the use of pure 

 gum spirits. * * * 



The evaporative values of these turpentines are satisfactory in every case, 

 No. 3 evaporating more rapidly than the others, and none of them leaving any 

 stain. 



NOTE. The panels painted with these test paints were exposed in September, 

 1910 (see Bulletin 30, Paint Manufacturers' Association), and the report of an 

 inspection made in February, 1912, includes the following paragraph : 



The panels which were painted with pigment formula 31 ground in pure 

 linseed oil and reduced with various wood turpentines as thinners, indicated 

 that the highest types of these materials were well suited to replace pure gum 

 spirits of turpentine as a thinner for paints to be exposed out of doors. Wood 

 turpentine No. 2 gave the whitest surface, while wood turpentine No. 5 gave 

 the darkest. 



REPORT 5. 



No. 2: This is the best sample both in regard to odor and color and other 

 qualities ; it compares satisfactorily with gum spirits. 



Nos. 4 and 5 : These rank about the same from our point of view, being some- 

 what inferior to No. 2. No. 4 is lighter in color but No. 5 has less objectionable 

 odor. 



