Way to whiten old bricks that have yellowed slightly that doesn't quickly get worse?

[CSEverett1759]

I'm trying to use some white bricks that have been out of production for decades, and naturally they've yellowed slightly, and a bit too much for use with a white rocket. Is there any way to whiten them that doesn't get far worse then before after a year? I've whitened bricks with hydrogen peroxide in the past, and now they're far worse then when I started.

 

Thanks.

[Murdoch17]

In short: No, there is nothing you can do. Retrobrighting is just a temporary fix and parts will get worse over time.

[MAB]

You could try hydrogen peroxide again. I found when I did it, some yellowed again whereas others have remained white for years.

Or buy replacement bricks from bricklink.

 

Edited 3 hours ago by MAB