68 



WOOD TURPENTINES. 



The paints made up according to the first formula dried very rapidly and 

 quite flat. This was due to the large amount of thinners used. The first coat 

 dried hard in one and one-half hours, and there was no appreciable difference 

 in the drying time of any of the paints. The test turpentine paints and the 

 standard paints were applied to steel plates and were exposed to the weather 

 October 16, 1911, and examined July 28, 1912. It should be noted that the 

 paints mixed according to the above two formulas were applied over two prim- 

 ing coats of red-lead paint. 



(6) Examination of the paints showed the paint surface to be still intact 

 but easily chalked up, though no signs of corrosion were apparent. The test 

 turpentine paints were equal in all respects to the pure spirits of turpentine 

 paints. 



(7) The paints made up according to the second formula were applied, as in 

 all cases, for exposure test against standard paints on steel plates, and these 

 paints were exposed to the weather October 16, 1911. The drying of these 

 paints was somewhat slower than the first formula paints of the third series, 

 but not excessively, the first coats drying in three hours. The paints contain- 

 ing samples Nos. 2, 4, and 5 were somewhat more rapid than No. 3 paint. 

 The results of the examination showed the paints to be in very good condition, 

 chalking but slightly and protecting well the steel plates. 



(8) A series of inside white paints were made with the test turpentines, 

 compared to standard inside white paints containing pure spirits of turpentine. 

 The following formula was used : 



Parts 

 by weight. 



" Ponolith " 60 



Zinc oxide 120 



China clay 20 



Parts 

 by weight. 



Linseed oil 50 



Manganese drier 2 



Test turpentine 50 



The inside white paints, made up according to the above formula, were ap- 

 plied in different parts of a large room at separate times, so that the effect 

 of painting in a confined space might be determined ; no ill experience by the 

 painters, and the odors were not unpleasant. 



(9) The chemical analysis of the various samples of wood turpentine sub- 

 mitted follows. The samples show on examination : 



Sample. 



None of the samples leave a spot when one drop is evaporated from filter 

 papers. 



When subjected to distillation, 86 per cent of sample No. 2 passes over be- 

 tween 309 and 330 F., 96 per cent having passed over when a temperature 

 of 355 F. has been reached ; 55 per cent of sample No. 3 passes over between 

 314 F. and 330 F., 96 per cent having passed over when a temperature of 362 

 F. has been reached ; 91 per cent of sample No. 4 passes over between 309 F. and 

 330 F., 97 per cent having passed over when a temperature of 350 F. has been 

 reached ; 89 per cent of sample No. 5 passes over between 311 F. and 330 F., 97 

 per cent having passed over when a temperature of 350 F. has been reached. 



All possess the characteristic odor of wood turpentine. 



It will be noted from the above chemical analysis that the samples are not in 

 conformity with the specifications for spirits of turpentine, 52-T-2, of Decem- 

 ber 30, 1911, in the distillation tests ; all practically conform in specific gravity ; 



