Hydrogen Peroxide, and activator, and more UV light finish the job and allow the bromine to fly free, leaving the surface of the ABS entirely. Over time and exposure to UV light, the bromine finds its way to the surface, lending the yellow cast. The basic chemistry of it, as detailed in the retr0bright project page, is that there was bromine added to the ABS plastic to act as a fire retardant. ![]() The yellowing on the case was pretty gnarly, so I took it fully apart and used the hydrogen peroxide + UV light method to reverse the ageing. Then, I cleaned out the cartridge slot so it would actually load games. First, I needed to re-solder the battery connectors to the PCB so it would start up. ![]() I got this launch edition 1989 Nintendo Gameboy at a yard sale for $1 and decided to restore it and clean it up.
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