  Flash bulb wool. 
I have a magnesium including magnesium-based flash powder and magnesium ribbon used to expose photographic plates. 
Bulbs like the one this wire came from were ubiquitous for decades, used by amateur and professional photographers alike.  These days it's hard to imagine a world where taking a photograph actually cost money and used up physical supplies like film and flash bulbs. 
Source: Juan Jimenez 
Contributor: Juan Jimenez 
Acquired: 6 April, 2007 
Text Updated: 19 May, 2007 
Price: Donated 
Size: 1" 
Purity: >90%
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