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Author Topic: Non-retr0bright de-yellowing.  (Read 16632 times)

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Offline paul1981

Re: Non-retr0bright de-yellowing.
« on: January 25, 2017, 07:31:49 PM »
Hello there. So you didn't treat the plastic except for blasting it with raw sun light? And this actually reduced yellowing? Sorry if I'm being dumb here (wouldn't be the first time), but that sounds like an April fool. :laughing:
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #1 on: May 18, 2019, 11:54:09 AM »
Sorry about your Quadra case. I suppose now you'd wished you'd either left it alone or sprayed it white.  :(
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #2 on: May 20, 2019, 11:46:25 AM »
Can you do a follow up post in six months to see if it has reverted somewhat?
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #3 on: May 22, 2019, 10:03:40 AM »
I tried this with my A500 plus a few days ago, the keyboard in particular had yellowed quite a lot.
Just after a day I could see the keys were less yellowed, without even taking a before photo. I will get it out in the sun again when I get chance (and when we have some sun here in Runcorn).
If it works, I am going to have to employ a security guard in my back garden with all this hardware outside  ;D

Where do you live? I'll volunteer.  :D
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #4 on: May 25, 2019, 11:21:40 AM »
So let me get this straight - Heavy, pure unfiltered exposure to sun will turn plastics back to white, yet intermittent less powerful sun rays such as shining through windows onto your Amiga desk in the morning will turn them yellow? And too much exposure will actually cause them to go brittle (even if they do turn white)? It's all a bit confusing.
Some plastics turn yellow with age anyway right? I have this gel mousepad and the white plastic has turned yellow about 33% I believe from what it used to be yet it has never had any sunrays on it whatsoever.

So, that mouse for example...it looks much better now. How do you stop it returning yellow again? And from what I've read, any treatment will mean a return of the yellow much sooner than it normally would in getting there in the first place? Also, isn't they yellow just on the surface and not below it? I'm sure it rubs off with a bit of abrasive cleaning but at the cost of ruining the textured surface. I have a very yellowed Archimedes mouse so I do have an interest here.
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #5 on: May 26, 2019, 05:49:11 PM »
Yellowing is on top on a thin layer.
Also it comes back in a  2-3 months or a year.
I had a usb wifi card that turned yellow and used retrobright.
In 2 month period was like a canari again...
Even an A500 was back to yellow in a box.
Maybe just heat does the job.

So the best bet then is a can of white spray paint?
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #6 on: May 26, 2019, 05:54:55 PM »
Toothbrush + Toothpaste = White Color

How long does that last?
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #7 on: May 27, 2019, 08:41:40 PM »
Hard to say. It all depends on the plastic and how to use it.

Use polishes. Such tools create an invisible film on the surface - it protects against external influence.
Read more: https://ksportal.ru/901-kak-otbelit-pozheltevshij-plastik.html

I'll get some Mr Sheen on my existing pastics then. As for old yellowed plastics I'm non the wiser!
 

Offline paul1981

Re: Non-retr0bright de-yellowing.
« Reply #8 on: May 31, 2019, 01:01:14 PM »
These UV filter sprays and UV filter house window glass do they really stop plastics yellowing? Or is that you'd still have to keep them out of direct sunlight but that they help reduce the effect?
My first A1200 used to get morning sun for a few years, but even on the left hand side of the computer which was in the shade it still managed to yellow. So I think the sunlight (probably mostly invisible UV) must reflect off the walls and back onto the shaded area...yellowing it. This is where I feel the UV filtering may help.

Mancave? That's definitely the best bet. Of course, lock your Amiga(s) in the cellar and don't give them the light of day!  ;)