Retrobright is a hydrogen peroxide-based process for removing yellowing from ABS plastics.
A TRS-80 Color Computer showing significant yellowing
The same computer after treatment, showing yellowing largely reversed
Hydrogen peroxide is a chemical compound with the formula H2O2. In its pure form, it is a very pale blue liquid that is slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution in water for consumer use and in higher concentrations for industrial use. Concentrated hydrogen peroxide, or "high-test peroxide", decomposes explosively when heated and has been used as both a monopropellant and an oxidizer in rocketry.
ISO tank container for hydrogen peroxide transportation
A tank car designed for transporting hydrogen peroxide by rail
Australian bombardier beetle
Contact lenses soaking in a 3% hydrogen peroxide-based solution. The case includes a catalytic disc which neutralises the hydrogen peroxide over time.