  Mixed firefly aluminum. 
This firefly aluminum is a grade of mixed-size aluminum particles, flakes, and curls that is used in fireworks to give a long hang-time sparkle effect.  The different sizes spread out the effect over a wider range of distances and times than any single size would allow. 
Source: Skylighter 
Contributor: Theodore Gray 
Acquired: 28 February, 2009 
Text Updated: 9 April, 2009 
Price: $20 
Size: 2" 
Purity: 99%
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