Okay, so you've got a vintage computer or whatever and the case has gone all yellow-brown? Thought you were doomed, 'cos, hey, the plastic is deteriorating?
Maybe not. The "browns with age" thing is a chemical reaction, all right, from fire-retardant chemicals in the plastic (likely containing bromine, if I understand what I've read so far) and the effect can be reversed! Not totally, but it'll take an old smoker's-lung computer case a long ways back towards the original hue. Have a look here (retrocomputer hobbyist BBS).
Dabba Oxy-Clean, bitta 12% hydrogen peroxide, UV light, good ventilation, use eye protection, do not ingest mixture, keep away from kids, pets and Leftists, yadda-yadda. I have not tried this, just sharin' what stumbled across.
It's entirely possible this trick may have other applications. Experiment at your own risk.
T. R. MCELROY'S STREAMLINED TELEGRAPH KEYS
11 months ago