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Bath Bombs: Alka Seltzer for a fraction of the cost

Boing Boing found this 12/19/2008 on instructables.com

As I was making bath bombs to give for Christmas I felt a little heartburn. I reached for the Alka Seltzer... Wow... $8.99 for 36 tablets! One dose is made of 2 tablets, so that comes to 50 cents per dose. Then I looked at the active ingredients. Citric acid and sodium bicarbonate.