PAINT PIGMENTS AND TIIEIK PROPERTIES 43 



15% of carbon dioxide and water. Its opaque nature and 

 excellent body renders it extremely valuable as a constituent 

 of paints. Checking and chalking progress rapidly when the 



Crystals of Cerussite in Old Dutch Process White 

 Lead. (Greatly magnified) 



White Lead (Quick Process) 



pigment is used alone. The various sized particles, both large 

 and small, resulting from the corrosion process, are prominently 

 shown in the photomicrograph. 



On account of its alkaline nature, this pigment acts upon the 

 saponifiable oil in which it is ground, forming lead soaps which 



