The ABS plastic used in the casing of some older SNES and Super Famicom consoles is particularly susceptible to oxidization on exposure to air, likely due to <answer>an incorrect mixture of the stabilizing or flame retarding additives</answer>. This, along with the particularly light color of the original plastic, causes affected consoles to quickly become yellow; if the sections of the casing came from different batches of plastic, a "two-tone" effect results. The color can sometimes be restored with UV light and a hydrogen peroxide solution.
What mixture error in the plastic caused some SNES cases to turn yellow?
an incorrect mixture of the stabilizing or flame retarding additives