Removing yellowing from Amigas with peroxide - Page 8

Merlin · 03 August 2008, 20:15

As a way of saying thanks to the guys over at a1k.org (Luzypher and AMike I think, from reading around) I have posted our perfected de-yellowing method over at A1k.org. It seems only fitting seeing as they started the ball rolling on this.

Merlin · 06 August 2008, 20:43

Ultra-sad chemistry nerd that I am, I looked up the flame retardants in The Plastics Handbook at work (yes, I really was that bored!).

The main ones used in thermoplastics are polybrominated diphenyl ethers (our prime suspect for the yellowing) and antimony trioxide. Bromine compounds are yellow-brown, does that sound familiar....??

I just thought you may be interested....

*ahem*

Kristian95 · 06 August 2008, 21:09

this is really cool

For once my German skills came in handy (ok, with the GBA1000 as well hehehe)

laser · 06 August 2008, 21:24

Quote:

Discoloured mouse soaked in strong solution of bleach and oxy only (no peroxide) for two hours on Sunday evening and left dry all day yesterday in direct sunlight.

Attachment 17336

Attachment 17337

I couldn't believe it

good work !!!

can you explain please step by step what kind of bleach and oxy you have used that in 2 hours did that miracle?

Merlin · 06 August 2008, 21:32

Using bleach is a bad idea, it's hypochlorite, not peroxide. It might cause worse yellowing in time. Chlorine is a halogen, the same periodic table group as bromine and will scavenge oxygen causing yellowing.

I reckon the "Oxy" made peroxide all of it's own in solution, the product also contains perborates which can react with TAED to make peroxides in solution.

Also, you risk the "Oxy" reacting with the bleach releasing chlorine gas, not good....

I would get some hydrogen peroxide solution from your local hairdressing supplies, somewhere like "Sally" in the UK. Add no more that 5 grammes per litre of "Oxy" as it may foam up a lot.

Shoonay · 07 August 2008, 06:40

@ Magno Boots

It's a chameleon!!!

rkauer · 08 August 2008, 04:10

I tested the bleach+TAED solution on a rubber ball of an old Amiga mouse full of not-funny brown marks.

Guess? Works too!

The apparently new one was the worst of the group.

Here is it with two other "next victims" of the process:

Charlie · 08 August 2008, 19:13

Three mice balls..?

What were you doing before you gave them the old peroxide treament..?

rkauer · 09 August 2008, 02:15

Eheh, they are inside the respective mice. Not funny things made with them.

BTW: not peroxide. I had try the bleach + oxy treatment.

wobbly · 09 August 2008, 08:25

could someone please post a you tube video on this would be great to see how many hits it would get

Merlin · 09 August 2008, 10:04

@ wobbly

Something like this is being worked on.... I am sworn to secrecy on pain of death....

wobbly · 09 August 2008, 10:53

would not like to see anything happen to you but thank you for the info

Merlin · 04 September 2008, 23:01

Here's some independent proof that the process works, this is a before and after picture of some keys and case parts from an Osborne 1 computer being cleaned on the Vintage Computer Forums. These were treated in Arizona sunshine for six hours with 30% peroxide and 1/8 teaspoonful per gallon of Oxy.

chiark · 04 September 2008, 23:24

Blimey!

The 1000 really would appreciate this... Need to test on an inconspicuous bit first tho!

rkauer · 04 September 2008, 23:52

That Osborne computer is the special "Ozzy" version?

Dexther · 05 September 2008, 13:27

Is possobile to stik a quide definitive ?

Merlin · 05 September 2008, 14:40

Quote:

Originally Posted by Dexther

Is possobile to stik a quide definitive ?

Certainly, I think we've had enough trials on various boards now to be able to draw up a "Cleaning Computer Cases for Dummies" guide.

I'll put one together over the weekend.

alexh · 05 September 2008, 15:23

Quote:

Originally Posted by Merlin

this is a before and after picture of some keys and case parts from an Osborne 1 computer being restored on the Vintage Computer Forums

No it isn't. It's some untreated and treated parts. Not quite the same

Merlin · 05 September 2008, 15:40

OK Alexh, maybe not quite the same, but you have to admit, that is being a tad pedantic...is cleaning not a form of restoring something to it's original condition?

AlfaRomeo · 05 September 2008, 15:51

I even don´t know what is oxy or peroxide..

it is a product we can buy in drugstore or a chemist compound you make or what?

If we can buy it what is the mark? Any fotos of that weird thing will be welcome

06 August 2008, 20:43	#142
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	Ultra-sad chemistry nerd that I am, I looked up the flame retardants in The Plastics Handbook at work (yes, I really was that bored!). The main ones used in thermoplastics are polybrominated diphenyl ethers (our prime suspect for the yellowing) and antimony trioxide. Bromine compounds are yellow-brown, does that sound familiar....?? I just thought you may be interested.... ahem Last edited by Merlin; 06 August 2008 at 20:59.

06 August 2008, 21:32	#145
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	Using bleach is a bad idea, it's hypochlorite, not peroxide. It might cause worse yellowing in time. Chlorine is a halogen, the same periodic table group as bromine and will scavenge oxygen causing yellowing. I reckon the "Oxy" made peroxide all of it's own in solution, the product also contains perborates which can react with TAED to make peroxides in solution. Also, you risk the "Oxy" reacting with the bleach releasing chlorine gas, not good.... I would get some hydrogen peroxide solution from your local hairdressing supplies, somewhere like "Sally" in the UK. Add no more that 5 grammes per litre of "Oxy" as it may foam up a lot. Last edited by Merlin; 06 August 2008 at 21:37.

08 August 2008, 04:10	#147
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	I tested the bleach+TAED solution on a rubber ball of an old Amiga mouse full of not-funny brown marks. Guess? Works too! The apparently new one was the worst of the group. Here is it with two other "next victims" of the process: Attached Thumbnails

04 September 2008, 23:01	#153
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	Here's some independent proof that the process works, this is a before and after picture of some keys and case parts from an Osborne 1 computer being cleaned on the Vintage Computer Forums. These were treated in Arizona sunshine for six hours with 30% peroxide and 1/8 teaspoonful per gallon of Oxy. Attached Thumbnails Last edited by Merlin; 05 September 2008 at 15:37. Reason: Alexh taking pedantism to new heights

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03 August 2008, 20:15	#141
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	As a way of saying thanks to the guys over at a1k.org (Luzypher and AMike I think, from reading around) I have posted our perfected de-yellowing method over at A1k.org. It seems only fitting seeing as they started the ball rolling on this.

06 August 2008, 21:09	#143
Kristian95 A4000T owner :) Join Date: Jan 2006 Location: California, USA Age: 49 Posts: 498	this is really cool For once my German skills came in handy (ok, with the GBA1000 as well hehehe)

07 August 2008, 06:40	#146
Shoonay Global Caturator Join Date: Aug 2004 Location: Porando Age: 43 Posts: 6,108	@ Magno Boots It's a chameleon!!!

08 August 2008, 19:13	#148
Charlie . . Mouse . . Join Date: Jun 2005 Location: Nowhere Age: 55 Posts: 1,792	Three mice balls..? What were you doing before you gave them the old peroxide treament..?

09 August 2008, 02:15	#149
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Eheh, they are inside the respective mice. Not funny things made with them. BTW: not peroxide. I had try the bleach + oxy treatment.

09 August 2008, 08:25	#150
wobbly Registered User Join Date: Jan 2008 Location: Australia Posts: 130	could someone please post a you tube video on this would be great to see how many hits it would get

09 August 2008, 10:04	#151
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	@ wobbly Something like this is being worked on.... I am sworn to secrecy on pain of death....

09 August 2008, 10:53	#152
wobbly Registered User Join Date: Jan 2008 Location: Australia Posts: 130	would not like to see anything happen to you but thank you for the info

04 September 2008, 23:24	#154
chiark Needs a life Join Date: Jan 2008 Location: England Posts: 1,707	Blimey! The 1000 really would appreciate this... Need to test on an inconspicuous bit first tho!

04 September 2008, 23:52	#155
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	That Osborne computer is the special "Ozzy" version?

05 September 2008, 13:27	#156
Dexther Registered User Join Date: Aug 2005 Location: italy Age: 46 Posts: 148	Is possobile to stik a quide definitive ?

05 September 2008, 15:40	#159
Merlin AmiBay MegaMod Join Date: Mar 2007 Location: Manchester, UK Age: 62 Posts: 1,163	OK Alexh, maybe not quite the same, but you have to admit, that is being a tad pedantic...is cleaning not a form of restoring something to it's original condition?

05 September 2008, 15:51	#160
AlfaRomeo A1200 040 SAM440EP 667 Join Date: Jan 2008 Location: Lisbon / Portugal Posts: 873	I even don´t know what is oxy or peroxide.. it is a product we can buy in drugstore or a chemist compound you make or what? If we can buy it what is the mark? Any fotos of that weird thing will be welcome

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