Actually it is an evolving game. It is just the UV that restores the whiteness back in most cases. Restoring molecules is not necessarily it, the TAED catalyst

Actually it is an evolving game. It is just the UV that restores the whiteness back in most cases. Restoring molecules is not necessarily it, the TAED catalyst sounded plausible, but a lot of retrobrighting goes on with just the peroxide solution and sun. But even then the peroxide was found to not be it. Indoors you don't get the same UVA/UVB as outdoors, so it initially seems counter intuitive to think that that yellowed computer case would go white again if put out in the sun. But it works. No voodoo chemicals needed. It comes down to bones and how they always end up white, bleached from the sun. Try it.