Removing yellowing from Amigas with peroxide

[manicx]

Originally Posted by demolition

Just read through the posts in this thread. There are lots of tips from people who have tried different things. Dos and don'ts.

Well, that's what I am trying to avoid, to go through 50 pages of posts !

[demolition]

Originally Posted by manicx

Well, that's what I am trying to avoid, to go through 50 pages of posts !

So you'd rather someone else did the hard work and summarised the entire thread in one post for your convenience?

[drwhy]

Hi ! Nice thread here !!
I´ve seen that the Amiga-Logos with the metallic "C" on them survive this process,
but what about the labels on the backside of the cases (serial number, rubber feet, etc ...)
do they survive too ?
Or do i have to remove them first ?
greetings

[VresiBerba]

Can a UV lamp be used instead of putting the items under sunlight, the latter is a bit lacking these days.

[Mr B]

Since the thread seams to have come to the conclusion that heat, rather then UV, is the important factor, I'd say "no", but i guess that depends on your UV light...

[XsamX1987]

Does this effect the keys or case plastic at all like making them brittle ?

[A4000Bear]

Originally Posted by XsamX1987

Does this effect the keys or case plastic at all like making them brittle ?

No, as the solution only affects the surface of the plastic, not the internal structure. Some people have claimed it does, but I would be inclined to blame long term exposure to heat and light. The same things that most likely caused the plastic to go yellow in the first place.

Here is how I do it. My method helps avoid the uneven results some people get by completely submerging the item in sodium percarbonate solution (assuming the plastic was not already damaged by heat or UV light as mentioned above).

http://members.iinet.net.au/~davem2/...etrobrite.html

[XsamX1987]

Thanks for getting back to me

[Mathesar]

I have retrobrited my A3000 today. I used the original recipe consisting of H2O2, xanthan gom, glycerine and oxi action. The only difference is that I used 3% instead of 12%. I am scared of the stronger stuff, especially with a little toddler running around. The miggy was in the full sun from ca 9:00 to 18:00.
I regularly re-applied and kept it under clingfoil. The picture shows the result. Stains! I hope this is just some leftover yellowing and that I need to redo it this weekend. Or did some kind of bleaching occur? What is strange is that the part that wasn't so yellow (because it was under the optional drive cover) seems less white than the surrounding parts ! The 3000 was very yellow btw.

I tried the same recipe before on a not-so-yellow 500 and that came out great.

Can anyone advice?

Mathesar

[dJOS]

Originally Posted by Mathesar

I have retrobrited my A3000 today. I used the original recipe consisting of H2O2, xanthan gom, glycerine and oxi action. The only difference is that I used 3% instead of 12%. I am scared of the stronger stuff, especially with a little toddler running around. The miggy was in the full sun from ca 9:00 to 18:00.
I regularly re-applied and kept it under clingfoil. The picture shows the result. Stains! I hope this is just some leftover yellowing and that I need to redo it this weekend. Or did some kind of bleaching occur? What is strange is that the part that wasn't so yellow (because it was under the optional drive cover) seems less white than the surrounding parts ! The 3000 was very yellow btw.

I tried the same recipe before on a not-so-yellow 500 and that came out great.

Can anyone advice?

Mathesar

I'd suggest there are oils and cigarette residues on the surface of the plastic which are causing the inconsistent yellowing removal. I use the Vanish oxyaction liquid as the detergent seems to remove these at the same time.

I also put big parts in the dishwasher on low heat and a short 30 minute wash first.

[Mathesar]

Originally Posted by dJOS

I'd suggest there are oils and cigarette residues on the surface of the plastic which are causing the inconsistent yellowing removal. I use the Vanish oxyaction liquid as the detergent seems to remove these at the same time.

I also put big parts in the dishwasher on low heat and a short 30 minute wash first.

I washed all the parts by hand with dishwashing soap.
Some parts I even used some scorching cream to get some 30 years of dirt of.

I hope I can fix this...
Today the parts are out in the sun again. Maybe 3% peroxide just needs some more time to get the really yellow parts nice again.

[michaelz]

Originally Posted by Mathesar

I washed all the parts by hand with dishwashing soap.

Some parts I even used some scorching cream to get some 30 years of dirt of.



I hope I can fix this...

Today the parts are out in the sun again. Maybe 3% peroxide just needs some more time to get the really yellow parts nice again.

I use 9% peroxide cream (same as the hairdresser uses). It's thicker then regular peroxide and almost the same price.

I have kids running around as well so I simply let it rest for about 4 hours in the bathroom. During the day they have no business being there and the one window provides enough sun for most applications.

[theslownorris]

I used peroxide on my A1000 and 1080 monitor... Bad results.

Paint fell off case badges and the darker brown on the monitor wiped away when I washed of the peroxided.

I wouldn't do it, but if you do? be VERY carefull.

[theslownorris]

BTW the keyboard lettering survived perfectly.

I used 40%.

[franeti]

Hi! I have had issues with my A500 keys twice! I have ussed salon cream (30%) + sun for 3 hours and in both cases the keys have spots or marks (only the gray ones)... its very frustrating. Is it possible to fix it? Thanks

[dJOS]

Originally Posted by franeti

Hi! I have had issues with my A500 keys twice! I have ussed salon cream (30%) + sun for 3 hours and in both cases the keys have spots or marks (only the gray ones)... its very frustrating. Is it possible to fix it? Thanks

Get a large glass jar, insert the keys, fill it up with your retr0bright, put the lid on and put it in the sun for 4 hours (it's actually the heat, not the UV that causes the bromine to come out of the plastic so you dont need even exposure to each key).

Patches is usually due to uneven application of the retr0bright or residue from nicotine and finger oils.

[franeti]

Originally Posted by dJOS

Get a large glass jar, insert the keys, fill it up with your retr0bright, put the lid on and put it in the sun for 4 hours (it's actually the heat, not the UV that causes the bromine to come out of the plastic so you dont need even exposure to each key).

Patches is usually due to uneven application of the retr0bright or residue from nicotine and finger oils.

Do you think if a get liquid peroxide, can i fix it?
Thanks in advance
Regards



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[demolition]

My experience is that it cannot be fixed.. It seems to dissipate sligtly over time though as the keys slowly re-yellow.

[dJOS]

Originally Posted by franeti

Do you think if a get liquid peroxide, can i fix it?
Thanks in advance
Regards



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I use this stuff, it's almost a gel and the detergents are great for removing contaminants + it's quite cheap.

[franeti]

Originally Posted by dJOS

I use this stuff, it's almost a gel and the detergents are great for removing contaminants + it's quite cheap.

Vanish + liquid peroxide at the same time?


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