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#61 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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in general all chemical processes are sped up by adding heat, even exothermic reactions (heat producing ones), having said that UV might, for this specific reaction, work better, but what we should compare is the energy added to the system (i.e. KJ or calories of UV vs. heat)
![]() EDIT: I am a chemical engineer so I know what I talk about ![]() Last edited by Kristian95; 12 July 2008 at 07:27. |
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#62 |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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I think that heat and light will accelerate the process cause the dentists use a powerful light to accelerate the process while the bleach is in process
also they make hot the product with heat' water before application |
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#63 |
I hate potatos and shirts
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Yeah, chemistry basis.
I'm a plastic engineer, myself. But never learnt about removing anti-UV with peroxide. The anti-UV compound is what makes Amiga cases yellow, not the ABS itself. |
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#64 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
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A bubble tank would really assist this guys,
Grab a small fish tank, attach an air pump with a diffuser on the end of it. around 30-40% peroxide solution and a couple of 30watt UV lamps.... should make a HUGE difference ![]() |
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#65 |
Registered User
Join Date: Nov 2006
Location: Amigaville
Age: 46
Posts: 3,338
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Last night a Loreal hair shampoo advert came on.
If we got the secret peroxide formula and marketed it we could have Dizzy naked with an Amiga on the telly.. Lo-peroxide, because your Amiga's worth it... ![]() |
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#66 |
2 heads are more than 1
Join Date: May 2007
Location: Tauranga / New Zealand
Posts: 38
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I'm glad this has proven to work cause I was sus on the background of the first two images in the first post of this thread.
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#67 |
Workbitch 1.3
Join Date: Oct 2001
Location: Melbourne, Australia
Age: 47
Posts: 2,084
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Does the bleaching process change the surface of the plastic in any way? ie. does smooth glossy plastic become rough and matte?
edit: Oh and post some more pics... this is the amiga makeover thread after all ![]() |
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#68 |
Missile Command Champion
Join Date: Aug 2005
Location: Germany
Age: 52
Posts: 12,479
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#69 |
. . Mouse . .
Join Date: Jun 2005
Location: Nowhere
Age: 55
Posts: 1,792
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Peeps like Kristian95 will know a lot more about this process than me...
...H2O2 is going to work a treat on yellowed plastics (I'd use it myself if I could be bothered to buy some) BUT all plastic ages & any such chemical treatment WILL age it faster... ...this results in more brittle plastic. No big deal most likely but go easy on how long you stew your Amiga - you only want surface changes or you could end up with stuff snapping off! AND make sure you use a some kind of neutraliser (lots & lots & lots of water will do) so that the reaction stops when you're happy with the result. |
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#70 | |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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Quote:
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#71 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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plain water will do as H2O2 is not an acid or base just an oxidizer
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#72 |
I hate potatos and shirts
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OK.
Final picture of the process. ![]() Now all other caps are "swimming" in peroxide. ![]() But just to prove something, here is the result on those 3 caps I already tested (can someone notice the difference? ![]() |
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#73 |
Banned
Join Date: Aug 2006
Location: Argentina
Age: 51
Posts: 648
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well I have bleached 2 yellowed keys...and it works !!! I guarantee
the process took aprox 72hs ...but I think more yellowed=more time after long time we find a real solution for this !!!! yes !!!!! ![]() thanks Kristian95 for bring the info here to EAB!!! I haven't used light or heat as acceleration of the process....it doesn't need it...only a small flask inside my house away from light or heat........tomorrow I will post some pics Last edited by laser; 15 July 2008 at 04:57. |
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#74 |
A4000T owner :)
Join Date: Jan 2006
Location: California, USA
Age: 49
Posts: 498
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Super
![]() I'm happy to help rescue Amigas ![]() ![]() ![]() ![]() |
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#75 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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#76 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
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LOL at 70% H202 is considered a FUEL
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#77 |
Moderator
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 5,759
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Excellent! How does the printed stuff, like C= logo and caption on keys fare with this solution?
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#78 |
I hate potatos and shirts
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They not fall out, if is that you asking.
![]() Yellowing under the stickers don't go away, too (the stickers impeding this to occur). |
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#79 |
Needs a life
![]() Join Date: Jan 2008
Location: England
Posts: 1,707
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Cool. Just announced to the wife that I'm off to get some peroxide. She looked at me suspiciously...
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#80 |
AmiBay MegaMod
Join Date: Mar 2007
Location: Manchester, UK
Age: 62
Posts: 1,163
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We use 35% H2O2 at work, for bleaching dyestuffs out of our trade effluent and to buffer the pH after neutralising formaldehyde with caustic soda....
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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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