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#1 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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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 |
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#2 |
Zone Friend
Join Date: Feb 2006
Location: Hertfordshire
Posts: 688
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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. |
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#3 |
Missile Command Champion
Join Date: Aug 2005
Location: Germany
Age: 52
Posts: 12,478
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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. |
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#4 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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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. |
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#5 |
Missile Command Champion
Join Date: Aug 2005
Location: Germany
Age: 52
Posts: 12,478
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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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#6 |
Doogster
Join Date: Dec 2007
Location: Dorset
Posts: 1,069
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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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#7 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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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 ![]() |
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#8 |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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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. |
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#9 | |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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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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#10 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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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. |
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#11 |
Registered User
Join Date: Mar 2004
Location: finland
Posts: 1,848
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#12 |
Amiga Nut
Join Date: Oct 2006
Location: Belco, Australia
Posts: 2,242
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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. |
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#13 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,624
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Potassium Chlorate and some Tate & Lyle
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#14 |
Registered User
Join Date: Apr 2008
Location: UK
Age: 50
Posts: 181
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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? |
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#15 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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I suggest trying it on a key from an old PC keyboard, nothing to lose
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#16 |
Registered User
Join Date: Apr 2008
Location: UK
Age: 50
Posts: 181
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@kristian95 - good idea!
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#17 |
I hate potatos and shirts
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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? ![]() |
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#18 |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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btw,
anyone have made the experiment? |
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#19 |
Global Caturator
Join Date: Aug 2004
Location: Porando
Age: 43
Posts: 6,109
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#20 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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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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Thread | Thread Starter | Forum | Replies | Last Post |
A500+ Colour / Yellowing? | craggus2000 | support.Hardware | 25 | 22 November 2010 09:24 |
Removing Yellowing using H2O2, TAED & UV | alexh | support.Hardware | 31 | 21 February 2010 23:48 |
Guide to removing yellowing of plastics | tonyyeb | support.Hardware | 38 | 28 November 2009 19:23 |
Partial yellowing? | Amiga1992 | support.Hardware | 21 | 04 July 2008 00:46 |
Yellowing | BippyM | support.Hardware | 56 | 03 January 2003 20:08 |
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