44 



PAINT TECHNOLOGY AND TESTS 



accelerate chalking of white lead the greatest evil attending 

 its use. Solubility in carbonic acid of the atmosphere and 

 decay in the presence of sodium chloride may be active causes 



Corrosion cylinders used for making Quick Process White Lead , 



Lead Melting Pots 



of the rapid chalking of this pigment at the seashore. Checking 

 in some climates appears to proceed rapidly on white lead paints/ 

 in a deep hexagonal form, leaving a series of rough crests and 

 cracks. This checking is secondary to the chalking which takes 

 place. 



