  Quicklime.  
Quicklime is calcium oxide (CaO).  It used to be employed to make light.  Limelight.  These days its main applications are in mortar (it turns into limestone on exposure to air and water), and in disposing of bodies. 
Source: eBay seller lauram300 
Contributor: Theodore Gray 
Acquired: 8 May, 2007 
Text Updated: 9 May, 2007 
Price: $36 
Size: 1" 
Composition: CaO
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