Hydrogen peroxide (H2O2) is an extremely pale blue astringent with a markedly bitter smell sold at many stores. It has antiseptic and bleaching properties, but is actually detrimental to helping wounds when at concentrations exceeding 0.5%. The ideal concentration for pouring over a cut is 0.03%, which is a 100-fold dilution in the typically sold 3% solution bottles.
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A Lysol spray dispenser advertising hydrogen peroxide as an active ingredient.
A hydrogen peroxide bottle with a 3% concentration of H2O2.
Bottles of 35% concentration H2O2. These aren't sold in most stores, and are over 10 times more potent than the 3% variety.
A large plastic container of 90% H2O2.