AGAR AND RELATED PHYCOCOLLOIDS 87 



Esters of agar are often used as coatings or backing on films or plates to pre- 

 vent halation. These wash off in alkaline solutions. 



In the manufacture of tungsten wire agar is used as a suspending agent of the 

 graphite lubricant. Agar produced from Atlantic Coast Gracilaria has been found 

 superior for this purpose. 



The addition of agar granules to smoking tobacco has been found to serve as an 

 excellent moisture-controlling agent. 



Agar is also one of the most satisfactory gels for hectograph duplicators. 



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