mimo Posted January 28, 2009 Share Posted January 28, 2009 (edited) A few people have suggested that I post this in the 8bit forums rather than it hiding in the Restoration sticky. I stumbled across this method of getting rid of yellowing in it's infancy on the English Amiga Forumsand what can I say other than it really works. As an example here are before and after shots of my very yellow 800XL. This looked like it had been near a window as the yellowing was much worse on the right hand side. After a day and a half soaking the results speak for themselves. I have also tried this on a 400 and that worked very well. I tried some keys off a XEGS, but results were not so good-I plan to try this again when I have some spare time. I also plan on doing a 400,800,65XE and various other bits and bobs- stay tuned. I take no credit for this, I am just following other peoples instructions IF YOU DO THIS-IT IS ENTIRELY AT YOUR OWN RISK Here is a brief resume of the how/why 1. We have learned that a magic concoction has been created that can reverse the years of yellowing of plastics, caused by the brominated flame retardants (which were added to the plastic when it was a masterbatch) migrating to the surface of the plastic and attracting oxygen molecules which become attached by a co-ordinate bond. 2. Bromine molecules are susceptible to ultra-violet light, in that chemical bonds involving bromine molecules can become destabilised if irradiated by UV light. This is what we are exploiting to remove the oxygen molecule from the brominated flame retardant. 3. The yellowing can be reversed to a degree by immersing parts in hydrogen peroxide or "Oxy" on their own, however, on their own they don't do that much; what is needed is a chemical called TAED (tetra acetyl ethylene diamine), which is a chemical found in the "Oxy" type laundry boosters. Why is this useful? It's useful because it catalyses perborates and percarbonates in the "Oxy" to produce peroxides; it can also catalyse hydrogen peroxide, which is exactly what we want. This is what makes the mixture much more potent. 4. The optimum mixture and conditions for reversing yellowing of plastics seems to be the following:- A) Hydrogen peroxide solution, the strongest you can lay hands on; B) UV light, either as sunlight or a UV lamp; C) Approx 1/4 teaspoonful per gallon of "Oxy" laundry booster. Parts immersed in this mixture will have the yellowing reversed in six to eight hours on average. Severe yellowing may take longer but it will only be a matter of a day or two. The mixture once made will last about four days before all of the peroxide is spent. 5. A more recent development is that the mixture can be made into a gel. Initial tests with Xanthan Gum added to the original mixture have shown that it can be made into a thicker material which can be brushed onto surfaces. This mixture foams up but still removes the yellowing when put under UV light, and can remove yellowing in four to six hours. This method also drastically cuts down on the amount of liquid required and means large areas can be treated at a relatively low cost. Other thickeners such as corn starch, hydroxy ethyl cellulose, wallpaper paste, latex or similar inert thickener may also work, however, tests are in the early stages, feel free to try some of these and report back if they work. 6. Recent tests by Lorne have shown that powdered hair bleach and hydrogen peroxide solution can give a similar effect to the original "Oxy" mixture, however, there may be side effects associated with using this material; early tests have seen adverse effects on paint and stickers may also be affected by this product. The original "Oxy" mixture does not affect paint or stickers, unless the stickers are held on with a water based glue or are paper stickers. 7. If you are planning to do this in a hot climate, please be aware that this mixture will heat up during the day. Lorne is in Arizona and found that temperatures in excess of 100F (38C) and beyond were encountered, which caused some warping and distortion of large pieces. If this is the case where you live, always add the component to a cold mixture and check the temperature during the day. We will add to this original post in the thread as we learn more. If you wish to read the original thread, it's here:- http://www.vintage-computer.com/vcfo...ad.php?t=11877 The story continues......... Edited January 28, 2009 by mimo 7 Quote Link to comment Share on other sites More sharing options...
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