Thought I’d back up my post from AssemblerGames forums seeing as the forum looks like its closing soon and think this is handy info for anyone wanting to remove the yellowing from their retro consoles…
Have managed to scored a few PC-Engines, Core Grafx and Core Grafx II systems, the white PC-Engines were very yellowed so i used some 35% strength hydroperoxide mixed with water in a washing up bowl to bring back the white goodness!!..
Now the thing was the last few days there hasnt been a massive amount of direct sunshine, and its been very overcast, so it would appear that this method doesnt really need to have the sun to work just basic daylight UV!
While this method works excellent with white coloured systems, what would it do to the grey shell of the Core Grafx based systems??, as some of them appeared to be stained slightly. Would putting these grey shells in to the hydroperoxide mix de-colour the grey shell, as with the white shells not only did it bring the white back but it also removed stains on the shell as well??
PC Engine has a label on the bottom so I prefer to mask it with tape and use creme so the label isn’t damaged. Submerging would likely ruin that? Same with SG1000 and Mark III, submersion isn’t really an option due to paper labels.
To be fair its a white label with numerous numbers and characters on in a standardise font, nothing thats too hard to reproduce. Its not like it has a bar code or special symbol in reflective diamond finish label.
Ive heard far to many horror storys of people using the creme method which results in streaking and making it look worse than it did in the first place!, at least with submerging the case you’ll get an even covering.
But if you are worried about the labels you could cover them in clear nail polish/varnish to protect them!?
Yeah was my first attempt and was super please with the result.
Not much advice really as its straight forward and not much can go wrong BUT…
make sure you wear some gloves as getting the HP on your skin stings like buggery so make sure you wash your hands and keep away from your eyes.
In the morning i did top up the HP slightly as its suggested it loses its strength over a time, to be fair after the first 24 hrs i didnt really notice it getting any whiter
your might need to get a jam jar or the like and fill it with water and place it on the parts to keep them submerged as long as nothing is blocking the UV rays/sunlight thats why i went with a transparent bowl as well
when it starts reacting you should start seeing it bubbling ever so slightly, this is normal