Discussion Forum: Thread 306666

 Author: Pr1tch View Messages Posted By Pr1tch
 Posted: Jul 17, 2021 12:06
 Subject: How to restore colours of Lego
 Viewed: 121 times
 Topic: Help
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Pr1tch (99)

Location:  United Kingdom, England
Member Since Contact Type Status
May 28, 2020 Contact Member Buyer
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Hi,
How can we restore Lego to its original colour? We have bought some used parts
and some of the white and light aqua in particular have yellowed. We tried soaking
1 part with a small amount of diluted bleach then with Coca-Cola but neither
seemed to make any difference.
Thanks in advance
Ian & Carol
 Author: yorbrick View Messages Posted By yorbrick
 Posted: Jul 17, 2021 12:14
 Subject: Re: How to restore colours of Lego
 Viewed: 37 times
 Topic: Help
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yorbrick (1182)

Location:  United Kingdom, England
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Apr 11, 2011 Contact Member Seller
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In Help, Pr1tch writes:
  Hi,
How can we restore Lego to its original colour? We have bought some used parts
and some of the white and light aqua in particular have yellowed. We tried soaking
1 part with a small amount of diluted bleach then with Coca-Cola but neither
seemed to make any difference.
Thanks in advance
Ian & Carol

Look up retrobrite ot hydrogen peroxide and lego. Works OK on white.
 Author: SylvainLS View Messages Posted By SylvainLS
 Posted: Jul 17, 2021 12:19
 Subject: Re: How to restore colours of Lego
 Viewed: 44 times
 Topic: Help
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SylvainLS (46)

Location:  France, Nouvelle-Aquitaine
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In Help, Pr1tch writes:
  Hi,
How can we restore Lego to its original colour? We have bought some used parts
and some of the white and light aqua in particular have yellowed. We tried soaking
1 part with a small amount of diluted bleach then with Coca-Cola but neither
seemed to make any difference.

If by “bleach,” you mean chlorine (kitchen bleach), then it was a very bad idea. 
Chlorine damages most plastics and LEGO parts are not immune.  At the minimum,
it makes them brittle.

(Coca-Cola is not a very good idea either, I guess now the parts are all sticky
)

If you mean “hair bleach,” then it’s oxygen peroxide, and it’s the solution.
A 3% concentration, leave the parts a couple hours in the sun or a UV light. 
Some add a tiny drop of “oxyclean” or such whitening agent as catalyser.

The problem is that it doesn’t work well on some colours (e.g. light gray may
become very light in spots) and the yellowing often comes back after a few months.

You may also want to search about RetrObright & LEGO.

Or you can buy new bricks on BrickLink
 Author: popsicle View Messages Posted By popsicle
 Posted: Jul 17, 2021 12:32
 Subject: Re: How to restore colours of Lego
 Viewed: 68 times
 Topic: Help
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popsicle (6654)

Location:  USA, Washington
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In Help, Pr1tch writes:
  Hi,
How can we restore Lego to its original colour? We have bought some used parts
and some of the white and light aqua in particular have yellowed. We tried soaking
1 part with a small amount of diluted bleach then with Coca-Cola but neither
seemed to make any difference.
Thanks in advance
Ian & Carol

You guys may find this of interest: https://www.bricklink.com/message.asp?ID=1263616