Retrobright

A TRS-80 Color Computer showing significant yellowing
The same computer after treatment, showing yellowing largely reversed

Retrobright (stylized as retr0bright or retrobrite) is a hydrogen peroxide–based process for removing yellowing from ABS plastics.

Yellowing in ABS (acrylonitrile butadiene styrene) plastic occurs when it is exposed to ultraviolet light or excessive heat, which causes photo-oxidation of polymers that breaks polymer chains and causes the plastic to yellow and become brittle.

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