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How to remove yellowing from an old Atari case


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#976 jowi OFFLINE  

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Posted Wed Oct 31, 2018 10:42 AM

Oh yeah i'm gonna take my time; will hang the lamp pretty high, gonna take it one hour at a time and check etc :)



#977 jowi OFFLINE  

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Posted Sun Nov 11, 2018 1:24 PM

Retrobrighting went perfect :) only needed 6 hours under the 400W UV :) Did the keys as well, the lettering was white in about 2 hours. This is no lightbulb, this is an artificial sun ;)

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Edited by jowi, Sun Nov 11, 2018 1:35 PM.


#978 mimo OFFLINE  

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Posted Tue Feb 5, 2019 9:55 AM

looks good @jowi



#979 bfollowell ONLINE  

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Posted Sun Mar 24, 2019 1:51 PM

For those of you that are more experienced with cleaning and/or retrobrighting older Atari cases, do you remove your serial number label from the bottom of the machine, or tape/cover it off in some way to protect it during the process?

 

If you have found a way to remove it for the process, what tricks to you use?

 

I want to protect mine during the process. Removing it much the way a philatelist removes stamps from an envelope, then reapplying it later would be ideal, but I'm not sure that's really feasible.

 

Thanks for any advice.



#980 Kyle22 OFFLINE  

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Posted Sun Mar 24, 2019 9:30 PM

Nice, now hang the light over your Cannibis plants.

:)



#981 jowi OFFLINE  

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Posted Mon Mar 25, 2019 4:02 AM

I don't think they will bloom under extreme ultraviolet ;)



#982 AtariNerd OFFLINE  

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Posted Sat May 4, 2019 4:02 PM

So counterintuitive that is must have a certain truth:

 



#983 jowi OFFLINE  

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Posted Sun May 5, 2019 6:40 AM

So... the yellowing probably is caused by sunlight filtered through glass, and/or heat and ozone gas...?

I wonder if you can brighten using an UV light like in the 'old' method, but just leave out the peroxide... would be worth an experiment. Sadly i've got nothing to brighten at the moment...



#984 DrVenkman OFFLINE  

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Posted Sun May 5, 2019 11:46 AM

So... the yellowing probably is caused by sunlight filtered through glass, and/or heat and ozone gas...?

 

Nicotine, too. Don't forget that - it was a much bigger problem in the 70's and 80's, and even in the 90's. Lately as fewer people smoke and those who do mostly do it outside, it's not as big a factor. You can always tell when you open a machine that's been in a smoker's home though - the dust and dirt inside is almost sticky. The dirt cleans out but the residue is tacky and difficult to remove, even with isopropyl.

 

Good video - I watched it a few hours ago. If it ever stops raining and gives us a sunny day in the next couple weekends, I intend to try some lightening experiments of my own with a couple low-value bits I have around the house. 



#985 ToddL OFFLINE  

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Posted Sun May 5, 2019 8:54 PM

I read through the comments to the video. One person said if you see a computer that is yellow only on one side, it's actually the non-yellowed part that was in the sun. Several others mentioned that their computers turned yellow while stored in the attic (heat but no sun).



#986 _The Doctor__ OFFLINE  

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Posted Mon May 6, 2019 3:23 PM

and this is why I never used the peroxide methods people flocked to... I had better de-yellowing results by washing the stuff on an overcast day in the back yard, dirt, oils, smoke tar- what have you- came off nicely, and I didn't get sun burned, the plastics never got brittle, and the they all stayed nice and clean. I never put them in direct bright sunlight and I never bleached them... it sounded destructive to me no matter how much gobbledy-guk people were spewing.

 

All's well that ends well !!!  Glad I didn't follow the pack.



#987 jowi OFFLINE  

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Posted Tue May 7, 2019 1:59 AM

and this is why I never used the peroxide methods 

No it's not. This implies you knew this all along. Why didn't you tell us? Because... you did not know. So no, this is NOT why you never used the peroxide method.



#988 _The Doctor__ OFFLINE  

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Posted Tue May 7, 2019 1:32 PM

You must be kidding, the only like I more than likely gave for the entire thread would be to cleaning and disassembly in a post, and the only active argument I participated in was to the color of the computer more than likely about it being too light or even someone painting it. Lastly my big hint to what I thought about using accelerators and all this crap was a simple 'slow and steady wins the race' comment. Since I think my lack of likes, dislike of over bleaching changing the color, and my caution for folks to slow down. I really didn't think I needed to go to war against the thread and deal with crap that would come like your post just did.



#989 _The Doctor__ OFFLINE  

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Posted Tue May 7, 2019 1:33 PM

I am quite sure some 'chemist' will come along and contradict one way and then the other. You have not seen one posted retro-bright picture from me. You might consider some of that, so if a person goes all ape sh*t against something such as this myself they would be all wrong, and when I/they gently caution... I/they are wrong. I guess it's both good I'm wrong and I haven't bleached or made brittle any Atari Stuff. You will however read in many posts littered about, how cleaning and getting smoke tar and other things off made a bigger difference to me than all this other gobbledy-gook. Consider that and why I don't give instruction to do anything otherwise.  So d*mned if you do, d*mned if you don't. Picking a place somewhere in between will still get you the ole' internet smack job.

 

This appears to be the most I've posted in this dreaded thread. Now you see why I'm not a cheerleader :) and my 'Spidey' sense still tells me to stay away from it.


Edited by _The Doctor__, Tue May 7, 2019 1:49 PM.


#990 tjlazer OFFLINE  

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Posted Wed May 8, 2019 1:32 PM

Since the yellowing returns in a year or so I got sick and tired of obsessively dismantling the computer completely to redo the Retrobrite treatments!  Since I have a lot of Commodore and Atari and Apple computers this became a problem for me.  I can find other things to do with my time.  I found a much easier way that works pretty well as long as you are careful.  I don't dismantle the computer or keyboard at all.  I do it all in place with creme conditioner slightly watered down a bit and a brush.  I get the excess off the brush as much as I can and simply brush the case and keyboards (and this way I can avoid the labels, etc) and leave it out in the sun.  You don't apply much at all just a light coating that gets the keys and case wet.  No caking it on!  I reapply every 15-20 minutes and do the treatment for 4-6 hours and repeat the next sunny day as needed.  I can remove the yellowing in 4-6 hours on a nice hot sunny day.  When done you just wipe it down with some cleaner and dry it off.  Have't had any issues or spillage in to the keys as I make sure to keep the brush drip free when applying.

 

Here are a few quick videos I did:

 

Part 1:

 

Part 2:


Edited by tjlazer, Wed May 8, 2019 1:40 PM.





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