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Food grade hydrogen peroxide should not be used straight. It is very strong and dangerous at 35% strength. It must be diluted to 3% (11 parts water plus 1 part 35% hydrogen peroxide.) Then it still needs a lot of dilution again even before using in the sinuses.
Hydrogen peroxide is a chemical compound with the formula H. 2O. 2. In its pure form, it is a colourless liquid, slightly more viscous than water. Hydrogen peroxide is the simplest peroxide (a compound with an oxygenâoxygen single bond). It is used as an oxidizer, bleaching agent and disinfectant. Concentrated hydrogen peroxide, or high-test peroxide, is a reactive oxygen species and has been used as a propellant in rocketry. Its chemistry is dominated by the nature of its unstable peroxide bond.