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CASE YELLOWING!


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Thought I'd pick your brain. Does anyone know of any products or concotions that can aid in the removal of yellowing from old 80's computers. Was told once that they used to use dodgy paint to spray some computers or a pigment or something can't remember exactly. I've tried Jiff, metho and some other products but not much success. Any ideas? :unsure
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As far as I know the yellow is UV damage, I had it on my white C-64 and Amiga that sat in the morning sun sometimes.

I dont see how it can be reversed as its a plastic breakdown, I myself have tried various things in the past but nothing worked.

 

If its smoker tar yellow then maybe try these things

 

BiCard scrub with toothbrush

Mild bleach scrub with toothbrush

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Yah UV boosts it, but even in the dark it happens, as the plasticizers come out of the plastic. Once it gets real bad, the plastic gets brittle and crumbly.

 

Armourall (or however it is spelt) can work (it has all kinds of goop in it, including plasticisers), but IMHO it becomes an addiction for the plastic - if you stop using it the plastic accellerates it's journey to death, and it leaves a yucky greasy feeling to the plastic.

 

What to do what to do? You see 2 of the same thing, treated the same but one looks pristine, the other looks like it has a 2 pack a day habit. Black magic perhaps?

 

Look forward to seeing if there are any other home remedies out there! (how about a tooth-whitening system?)

 

Cheers

Jacob

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if it is anything like the snes, then there is no hope from what I read. Apparently, nintendo, in order to meet fire standards mixed some form of chemical into the plastic. Over time, the chemical caused the plastic to go yellow. I'll see if I can dig up the article....

 

Not sure if this is the same as for the c64 and amiga

 

link to article: http://www.houseofnintendo.com/50226711/why_the_snes_turns_yellow.php

 

unfortunately, vintage whatever is blocked at work so i can't verify

Edited by feeras
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The optimum mixture and conditions for reversing yellowing of plastics seems to be the following:-

 

A) Hydrogen peroxide solution, the strongest you can lay hands on;

B) UV light, either as sunlight or a UV lamp;

C) Approx 1/4 teaspoonful per gallon of "Oxy" laundry booster.

 

Parts immersed in this mixture will have the yellowing reversed in six to eight hours on average. Severe yellowing may take longer but it will only be a matter of a day or two. The mixture once made will last about four days before all of the peroxide is spent.

 

 

Very interesting link although the table in the picture appears to have been bleached as well. Wonder if this is trick photography? Sound interesting though nothing really to lose. Let you know how it turns out got a couple of IIe's that could use some bleaching. Thanks for the info :D

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  • 4 weeks later...

If its smoker tar yellow then maybe try these things

 

BiCarb scrub with toothbrush

Mild bleach scrub with toothbrush

 

 

Just don't use the toothbrush on your teeth after you try it ..... :badgrin

 

To be safe make sure you use your mates toothbrush instead ..... :badgrin:badgrin:badgrin

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that link is not about 'bleaching'. its actually reversing the chemical process that caused the plastic to go yellow. i still suspect that it will end up getting a very fine 'matt' finish which will be more prone to staining. worth experimenting with though. i dont have any things that have yellowed due to fire retardants though... Edited by danny_galaga
spelin
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