144 PAINT TECHNOLOGY AND TESTS 



felt cloth, rubbing them against the surface of the panel; the 

 degree of whiteness removed upon the cloth being indicative of 

 the amount of chalking taking place. General condition was 

 decided upon after carefully weighing the opinion of each member 

 of the inspection party, as regards the general characteristics 

 shown by each paint, such as checking, chalking, scaling, condi- 

 tion for repainting, hiding power, etc. The results have been 

 charted and presented in this manner: 1 



Panel on Left Painted with Single Pigment Paint; Panel on Right 

 Painted with Combination Pigment Paint. Photograph taken 

 after Two Years' Exposure on Pittsburg Test Fence 



" Conclusions Reached from the Test. The primary object 

 of the test made at Pittsburg was to determine whether a com- 

 bination paint, made of two or more pigments, would be equal 

 or superior to single pigment paints. After one year's exposure, 

 the combination type of paint proved more durable than the 

 single pigment paints. 



" It was early apparent that the combination type of paints, 

 that is, those paints made of more than one pigment, indicated 

 in most cases very excellent wear, with a minimum of blackness 

 and a general good condition of surface. 



" Recommendation. On account of the peculiar conditions 

 which obtain in and around Pittsburg, as exemplified by ..these 

 tests, the committee finds, as a result thereof, that the best white 



1 An endeavor was made to use uniform terms in reporting on each for- 

 mula. In some cases it was necessary to bring out more forcibly the con- 

 dition by the insertion of qualifying remarks. 



