  Quicklime Desiccant.  
This interesting little desiccant packet came in something I got from China.  Most desiccant packets (which are packed up with many products to keep them dry during shipping) are made with silica gel, but this one is made with quicklime (calcium oxide, CaO).  The difference is that if you pour water on silica gel it doesn't do much of anything, but if you pour water on quicklime, it becomes so hot it boils the water, producing steam and spitting hot water out. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 12 January, 2010 
Text Updated: 12 January, 2010 
Price: Donated 
Size: 3" 
Composition: CaO
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