[MattBearman]

I wonder if this is related to yellowing plastics? Retr0brighting with peroxide and sunbriting (putting yellowed plastics out in the sun) are already common treatments in the retro community. I’ll have to give it a try on some of my old hardware

[emsign]

This changes the best practice for retr0brighting from using UV or sunlight to 445nm blue LED. I already knew from anecdotes that sunlight seemed more effective than a UV lamp. People assumed it was the extra heat, which may or may not still be a contributing factor, but I guess it's the blue light prt of the sun's spectrum.

[dahrkael]

isnt the sun the one yellowing those plastics?

[jama211]

UV can trigger the chemical reactions within the plastics that yellow the plastics, but UV + peroxide does a different chemical reaction to bleach them.

[emsign]

Both is true

[iwontberude]

Exactly my first thought, thank you for trying it!