248 



PAINT TECHNOLOGY AND TESTS 



Panel No. 33 Asbestine. In the same condition as Panel 

 No. 32. 



Panel No. 34 American Vermilion. This pigment has 

 given perfect protection to the plates. The film is strong and 

 elastic, and upon removal reveals the bright steel. No chalk- 

 ing, checking, discoloration, or other signs of paint failure are 



Excellent Surface shown by American Vermilion after nearly 

 Four Years' Exposure 



shown. It would appear that the inhibitive characteristics of 

 this pigment are pronounced, and it promises to give efficient 

 service for several years more. 



Panel No. 36 Lead Chromate. This panel is in generally 

 fair condition, but slight checking is shown. 



