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Retrobright (stylized as Retr0bright) is a chemical mixture used to remove yellowing from acrylonitrile butadiene styrene (ABS) plastic computer and electronics cases. It has some effects of wearing down labels, but includes computers that were manufactured by Commodore and Apple in the 1980s and 1990s, and various video game consoles and cartridges. The original meaning has been expanded, so now "retrobright" often refers to indicate any H2O2 based process used to remove yellowing from ABS plastics. The usage has also expanded to other retro restoration applications, such as classic and collectible sneaker restoration.Yellowing is caused by both bromine and exposure to ultraviolet (UV) light. Many of the ABS plastics used in consumer electronics devices are typically "brominated"—combined with bromine as a fire retardant—to meet fire safety standards. The method of reversing the yellow discoloration was first discovered in 2007 in a German retrocomputing forum, before spreading to an English blog where it was further detailed. The process has been continually refined since.There is still some debate over the long-term effectiveness of this technique. Some have discovered the yellowing reappears, and there is discussion of factors that may result in this happening. There are also some concerns that the process obliterates the plastic.

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