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Old 06 August 2018, 23:41   #1101
coolname
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No UV required

Having watched David "The 8-bit Guy" and his Retrobriting experiments on YouTube; I decided to do an experiment of my own, both with peroxide but one with light and one without light. I am now 100% convinced that there is no need to use any form of UV light in order to Retrobrite...

I currently have 2 A1200s and both were in an equally bad state when I got them; each one very yellow and missing various keys. I decided to just focus on fixing one of them up (for now).

My photo shows both Amigas side by side. Obviously the one at the top is the one I worked on (with some missing key caps stolen from the donor machine). Its case was done with "salon creme peroxide" (12% 40vol), cling film and a day of British sunshine. Worked a charm, but in hindsight, the sunlight just served to keep everything warm.

The key caps were done separately overnight. I shoved them into a large freezer bag and covered with loads of creme peroxide before tying it up. The freezer bag was placed into a mop bucket full of hot water (58C) from the hot tap. I insulated the bucket as best I could with towels to keep the heat in (and the light out). I went to bed, not expecting much to happen, but the result speaks for itself.

I can't comment on the best strength of peroxide or the perfect temperature but my conclusion is that you just need peroxide and heat (and that the peroxide lightens much more quickly than the sun can turn things yellow)!
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Old 22 September 2018, 13:54   #1102
wizard66
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Thanks I will give this a try
I have a a1200 that needs some work !!
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Old 06 November 2018, 21:57   #1103
RiP
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Quote:
Originally Posted by dJOS View Post
Agreed, the best option is to put your yellow item in a plastic tub, then coat, then put cling wrap / plastic wrap over the tub itself. This keeps bugs away from it and boosts the greenhouse effect.
Thanks, any other tips to avoid blooming?
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Old 06 November 2018, 22:31   #1104
dJOS
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Originally Posted by RiP View Post
Thanks, any other tips to avoid blooming?
Yep, don't direct wrap the item and fully submerge it in the liquid - uneven coatings and cling wrap is what Ime causes the uneven or patchy effects.
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Old 08 November 2018, 20:58   #1105
Mr.Flibble
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IIRC the blooming is from the peroxide creme drying out?
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Old 08 November 2018, 23:12   #1106
dJOS
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Originally Posted by Mr.Flibble View Post
IIRC the blooming is from the peroxide creme drying out?
Yep, which is why I recommend full submersion.
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Old 21 November 2018, 12:18   #1107
highwinder
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Vanish Oxy Action powder

Just wanted to share my before and after photo of my A1200 keyboard. After reading through this thread decided to try mixing Vanish powder with water and outside sun exposure for 3 days, results were pretty good.

To stop the keys floating I split them over 3 take away tubs with just enough mixture to submerge them. Made sure they were all the right way up and then covered the containers with cling film to keep them submerged. Gave them all a gentle prod every few hours to keep them in the solution.
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Old 21 November 2018, 22:21   #1108
nogginthenog
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Wow. I have some Vanish Oxi Action "Fabric Stain Remover" under my sink that's probably 5+ years old.

Impressive. This stuff is cheap and readily available in at least AU & UK.
Main ingredient listed is Sodium Carbonate Peroxyhydrate.

Winter is approaching here in the UK but I have some UV sources.
I like this!
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Old 21 November 2018, 22:54   #1109
Mrz
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Quote:
Originally Posted by coolname View Post
I am now 100% convinced that there is no need to use any form of UV light in order to Retrobrite...
that's right
it works even in the darkness
The UV light is just a myth , which for some ppl accelerate the process, but is not true , or if is true only accelerates just a bit which is not worth spending time adding light or heat

anyways Retrobrite is obsolete , the earth's atmosphere is very corrosive for these bad quality plastics
unless you store the computer in a sealed box in vacuum ,the yellow in these plastics will return again
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