07 July 2008, 00:35 | #1 |
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Removing yellowing from Amigas with peroxide
A guy from A1k.org has had success removing yellowing from a floppy cover from his A4000.
He used hydrogen peroxide (H2O2) in the following way: Ingredients: - 30% H2O2, water added to lower concentration to 20% - Plastic container with lid. - Protective gloves and glasses (always use this when working with H2O2!) - Tongs to retrieve the Amiga part after bleaching - His yellowed floppy cover: He left it sitting in the sun on his balcony for 72 hours. Here is a before and after shot: before after |
07 July 2008, 00:44 | #2 |
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Nice find
I recently soaked some banana coloured keys in a mixture of bleach and vanish oxy for two days and left in direct sunlight for a further four days... the results were very good, but not pure white / ivory. I will try the peroxide test and post my findings. Thanks for the tip. |
07 July 2008, 00:59 | #3 |
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Hydrogen peroxide works fine with white or grey plastics as it seems, but take care you have rubber gloves or something else. This stuff etches extremly.
http://www.forum64.de/wbb3/index.php...threadID=19241 http://www.forum64.de/wbb3/index.php...927#post242927 Last edited by Retro-Nerd; 07 July 2008 at 01:09. |
07 July 2008, 01:24 | #4 |
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@Retro-Nerd:
Gloves are important but safety goggles are a _must_ get peroxide in your eye and chances are you will never be able to see with that eye again! This also holds true for hypochloride based bleaches. |
07 July 2008, 01:31 | #5 |
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You can also use a radiator next to your plastic container , if you don't want to bleach the pieces outdoors. I assume heat is the important thing for the bleaching process, not the sunlight. At least a friend of mine told me that.
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07 July 2008, 01:48 | #6 |
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I run a public swimming pool and have sodium hypochlorite at my disposal...i was thinking of trying it...i will now.
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07 July 2008, 03:54 | #7 |
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heat speeds up the process sure, but even just room temperature will do.
UV speeds up the process too.. what happens is: 2 H2O2 -> 2 H2O (water) + O2 (oxygen) and that bleaches the plastic |
07 July 2008, 04:45 | #8 |
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h2o2 also is used to bleach teeth but is applied in a format of gel instead liquid....a laser light is used as accelerator of the process
btw, concentrations up to 10% is used as medical product to disinfect and 20 % is used very often by some elderly women to tint hair..so I don't believe that 20 % will be so dangerous....precautions about use gloves and lens is really exaggerated Last edited by laser; 07 July 2008 at 07:00. |
07 July 2008, 07:07 | #9 | |
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Quote:
lot of womens use 20 % h2o2 everyday to tint own hair.....none of them use lens and none of them remains blind |
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07 July 2008, 09:09 | #10 |
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@laser:
Trust me, if you get 20% H2O2 in your eyes chances are you can wave goodbye to vision from that eye! I am a chemical engineer, I know what I talk about... but if you think it's safe be my guest, just consider yourself warned FYI: H2O2 will oxidize the proteins in your eye, this is a non-reversible process! An example of messing with proteins in a non-reversible way: fry an egg, and try to turn into a liquid egg again, can't be done. |
07 July 2008, 09:48 | #11 |
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07 July 2008, 13:28 | #12 |
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What about Sodium Percarbonate?
A lot safer to play with & I've got 3kg of it sitting right next to me PZ. |
07 July 2008, 14:01 | #13 |
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Potassium Chlorate and some Tate & Lyle
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07 July 2008, 17:47 | #14 |
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Blimey! That's an impressive change!
What would haappen to the letters on a keyboard though? I've got a very yellow A1200 keyboard. Anyone tried just Vanish Oxyaction? |
07 July 2008, 18:45 | #15 |
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I suggest trying it on a key from an old PC keyboard, nothing to lose
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07 July 2008, 20:29 | #16 |
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@kristian95 - good idea!
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07 July 2008, 23:57 | #17 |
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I can test the procedure in a brown (really dead, not even a zombie) A500 keycap.
Hmm... Where wifie put that damn thing? |
08 July 2008, 18:01 | #18 |
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btw,
anyone have made the experiment? |
08 July 2008, 18:04 | #19 |
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08 July 2008, 20:04 | #20 |
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@laser
You refer to the keyboard experiment? I don't think anyone has checked to see whether the lettering survives. |
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