Actiplaque is a mottling of dark blotches that tends to appear on the labels of older video game cartridges due to the gradual discoloration of the glue used to affix the cartridge labels. A video game is a Game that involves interaction with a User interface to generate visual feedback on a video device. It has been known to appear on the labels of games for various systems and made by various manufacturers, but is notoriously and most commonly found on Atari 2600 game cartridges manufactured by Activision, hence the name. The Atari 2600 is a Video game console released in October 1977 Activision Inc is an American Video game developer and publisher. Actiplaque has proven to be a major headache for collectors as most seek cartridges in mint condition, yet most Activision cartridges have light to severe blotching.
The true cause of actiplaque is unknown. It is reportedly caused by the combination of glue and paper used for the cartridge labels. Glue or adhesive is a compound that adheres or bonds two items together Paper is thin material mainly used for writing upon printing upon or packaging It has been theorized that exposure to light and moisture either causes or accelerates the development of actiplaque, but it has been observed even on newly opened factory-sealed games and it is unknown what, if anything, can be done to prevent it. Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700