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Dear Supporters,

Boy am I excited to share this with you. It just might turn the love of restoring these classic machines on its head. In a good way.

Here's how to retrobright, using just the sun. No seriously, just the sun. Because, SCIENCE.

As always feel free to suggest any ideas or fixes. Enjoy your early-bird access and thank you for all your ongoing support.

Your friend in retro, Perifractic

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Retrobrighting with just Sun? This forum says yes. ▼ Read description FAQ

On today's menu let's test an old but little known deyellowing technique found on a German forum, with the help of two of the world's top plastics scientists. 🙏 Become a patron & more: https://perifractic.com/patreon Please read FAQ below. I didn't invent this idea & am one of many messengers for it. And we've seen many happy results. Also however, great lightbrighting questions keep popping up. It would seem helpful to address them in one central place. But please watch the full vid before commenting; you wouldn't make a cake using only half the recipe. I went to great lengths to do a lot of due diligence for this one. Thanks! 📖 Sources: Dr James Pickett PhD, plastics scientist for GE for 30 yrs, who worked with me on the vid & literally wrote the book on polymer yellowing. He also co-invented a headlight deyellowing technology used in many modern cars. ✅ Peer review: Dr Richard Blair PhD, polymer yellowing scientist, Florida Space Institute. ☣️ Disclaimer: Needless to say, try this at your own risk. All plastics react differently. No guarantees. Don't try it for more than 3 days. Any deyellowing method is not good for plastic & can cause brittleness, as I say in the video. Don't try this at home, try it at work! FAQ: 1. "I've seen someone use this method & their case fell to pieces after 2 years!" Psychologists call this a "post hoc ergo propter hoc" fallacy. This "false cause" fallacy assumes that since x happened after y, y was the cause of x. In reality that can't be proven & as we know from these old cases, x (cracking) would have likely happened without lightbrighting. Fallacy explanation: https://youtu.be/5A7hSaoRv0g Here's a 10 year test of sunbrighting. No problems: https://www.forum64.de/index.php?thread/23585-versuche-zum-thema-gilb-bleichen-und-sonnenlicht-uv/&pageNo=12 My scientific responses to this on a forum were deleted by the moderator (whilst abusive comments remain.) My original comments can be retrieved via https://RemovEddit.com Aside from that 1 negative claim, there are plentiful reports from people who state it didn't cause cracks, years later. One should balance all the reports: https://photos.app.goo.gl/6UApqu9gxLLuQEAw6 A 30 yr old case has had 262,800 hrs of household heat, diffused UV, fluorescent light, even nicotine. In the vid I put them in the sun for 3 days = 24 hrs sun. Will a case with 262,800 hrs of exposure fail after 24 hrs more? The German forum haven't reported cracks: http://bit.ly/2wekI5X Dr Pickett's main paper was published 15 yrs ago & his advice is still that UV causes less brittleness than peroxide. If you've seen a case cracked, consider the fallacy, & the history of the case, from factory plastic injection ingredient ratio correctness, to 30 yr household conditions, to past peroxide use. 2. "Putting it in the sun is worse than using peroxide!" Lightbrighting is retrobrighting "minus" peroxide. Scientists say it is unlikely that removing harsh bleach will increase damage. 3. "Won't UV cause brittleness?" I address this in the video. Liquid peroxide can leach into invisible fissures in plastic, embrittling from inside. Conversely the science shows that UV is confined to the top 25-50 micrometers. 4. "I've seen cases reyellow a year after doing this!" That individual case's history aside, all deyellowing will undo to a degree. Peroxide is absolutely notorious for reyellowing, requiring repeated, even more damaging treatments. But, see this video for the LED prevention method. 5. "UV will damage the electronics!" - What about car electronics? - The chips are shaded by the case - Air vents are 90° to stop dust falling in, which shades UV - We regularly solder at 650°F for short periods, so backyard heat should be fine for longer periods - Chips reach 100°F+ in normal use x 30 yrs, & their highly ventilated cases are specifically designed to let hot air escape not 'hotbox' inside Summary: Think about how many awful peroxide results I've seen: classic machines streaked, ruined, crumbled, trashed. If you own a yellowed case & you feel there's nothing to lose by trying a method a top plastic yellowing expert says is safer, you are free to choose. If you use common sense, don't put it out for weeks, follow the advice & caution in the vid, & your case doesn't have an underlying issue, the science says you'll see nice results. Enjoy your refurbs! ✌️🕹️ ┄┄ ЯRECIPE INGREDIENTS: ┄┄ 🕹 Research paper: https://drive.google.com/open?id=1vE41ASE14kZVGjEFz_tsiLRLK3c928Eh 🕹 Turntable: 🇺🇸https://amzn.to/2DIW8yg | 🇬🇧https://amzn.to/2Wnc1BB 🕹 Headlight Deyellowing: 🇺🇸https://amzn.to/2Y2Cftt | 🇬🇧https://amzn.to/2VOviz3 💿 Stream the music: http://perifractic.com/music ┄┄ THANKS ┄┄ 🕹 Dr. Richard Blair, Florida Space Institute 🕹 Dr. James Pickett, a chemist who worked on these problems back in the 1980s 🕹 Superingo 🕹 The 9-Bit Guy 🕹 Jan Beta 🕹 Gaz Marshall ┄┄ WEBSITE ┄┄ 💌 http://perifractic.com All music & content ©1988-2019

Comments

Mike Fellows

Best retrobrighting vlog I've seen in ages, many thanks :o) Definitely give that a go as my hydrogen peroxide attempts have been far from successful lol

Marc Burkhardt

Question to the possible reason for the yellowing in the first place: you assume that slightly heat is the reason. But why some of the things are only yellowing ob the top? Or why does a sticker prevent the plastic from yellowing? Also flourencense light could have influence but in the most living rooms in Europe for example common bulbs are used, very seldom neon tubes. Simple Oxidation could also not be the reason, because the plastic is not yellowing in the inside. So I think we stull haven‘t found the guilty party.

Retro Recipes 👾 PowerUp!

Good question. Heat inside cases rises so the top is always warmer than the bottom. You haven't mentioned diffused UV-A, which would still not hit an area in shadow such as the bottom of the case. Other than that, different inconsistent plastic mixtures will also play a part.