  Bottle of Homemade hydrogen.
This is a very Martha Stewart sample: I made it from scratch with two batteries, two paper clips, and a cup of salt water. (Sorry Martha, I did not use flavored sea-salt.)
Making hydrogen gas is actually very easy, and you can read all about how to do it by clicking the story book icon for this sample.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 20 August, 2002
Price: $0
Size: 2.5"
Purity: >90%
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