  Drain opener (foaming).   
This is sodium hydroxide-based drain opener with a twist.  See the little shavings?  Those are probably either magnesium or aluminum, which will generate hydrogen gas when the sodium hydroxide is dissolved in water, creating a foaming action.  At least, I think that's the idea. 
Source: Farm & Fleet 
Contributor: Theodore Gray 
Acquired: 28 June, 2009 
Text Updated: 29 June, 2009 
Price: $10 
Size: 2" 
Purity: 56%
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