this post was submitted on 14 Oct 2025
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Let me be the one to introduce you to the rabbit hole that is retr0bright. There are numerous videos on youtube of various different methods of retro-brighting.
The most scientifically thorough treatment of the phenomenon that I've seen is this paper: https://hackaday.com/wp-content/uploads/2021/01/The-Retrobright-Mystery.pdf
No problem, let me just say that I haven't tried it myself but I've watched a lot of videos of other people trying it and the worst results that I've seen have been the ones using a gel that they paint onto the plastic and then cover in plastic wrap. This tends to leave a streaky effect because the substance is not equally thick in every area and so it has more whitening effect where it's thicker.
The best results that I've seen have been the ones that have completely submerged the plastic in a liquid peroxide solution, or have suspended the plastic above the solution to immerse it in the vapors that evaporate off from the peroxide (pure oxygen). These methods give completely uniform coverage so they whiten the plastic equally in every place.
It seems that you also need strong UV, and people that live nearer the equator have better success using the sun. But in the absence of good UV lighting, heat also seems to have some effect.
Good luck!
Soak the plastic in hydrogen peroxide and oxy booster stain fighter
For the rest of you ADHD havers who don't have the patience to get that write up to fit on your phone screen.