Retr0bright

Retrobright (stylized as retr0bright) is a chemical mixture used to remove yellowing from acrylonitrile butadiene styrene (ABS) plastic computer and electronics cases, including computers that were manufactured by Commodore and Apple in the 1980s and 1990s, and various video game consoles and cartridges.[1] The original meaning has been expanded, so now "retrobright" often refers to indicate any H2O2 based process used to remove yellowing from ABS plastics. The usage has also expanded to other retro restoration applications, such as classic and collectible sneaker restoration.

A TRS-80 Color Computer undergoing the retr0bright process
Showing significant yellowing
After treatment, showing yellowing largely reversed

Yellowing in ABS plastic occurs when it is exposed to UV light, among other factors, which causes photo-oxidation of polymers that breaks polymer chains and causes the plastic to yellow and become brittle.[2] The method of reversing the yellow discoloration was first discovered in 2007 in a German retrocomputing forum,[3] before spreading to an English blog where it was further detailed.[4][5][6] The process has been continually refined since.[1]

There is still some debate over the long-term effectiveness of this technique. Some have discovered the yellowing reappears, and there are concerns that the process weakens and only bleaches the already damaged plastic.[7][8][9]

Composition

Retrobright consists of hydrogen peroxide, a small amount of the "active oxygen" laundry booster TAED as a catalyst, and a UV lamp.[10]

The optimum mixture and conditions for reversing yellowing of plastics:

  • Hydrogen peroxide solution. 12% or 6% work the same, and even 3% has been used with success.[11]
  • Approximately 1 ml per 3 liters (1 part in 3000 by volume, alternatively 1⁄4 teaspoonful per US gallon) of tetraacetylethylenediamine (TAED)-based laundry booster (concentrations of TAED vary).
  • A source of ultraviolet light,[11] from sunlight or a UV lamp.[10] However, the YouTube channel "Modern Classic" demonstrated that exposure under UV-minimized fluorescent lighting for a period of 24 hours will give similar results.[12]

Xanthan gum or arrowroot can be added to the mixture, creating an easier-to-apply gel. In addition to homemade gel mixtures, hydrogen peroxide-based hair bleaching creams available at beauty supply stores can also be used as a ready-made mix.

Certain beauty salon products that are primarily composed of hydrogen peroxide can also be used as an alternative to retrobright, as it has been discovered to be almost identical in effect, and already viscous so that it can be applied less wastefully to yellowed plastics (especially large devices such as computer panels or monitors).[13][14] While this eliminates the difficulty of having to put together a batch directly from the instructions,[14] one must be careful to apply the cream and wrap consistently and evenly to avoid streaks in the final product.[15]

Sodium percarbonate (found in some eco-friendly bleaches and other cleaning products) may also be used by dissolving it in water and following the usual steps for hydrogen peroxide, as it is sodium carbonate and hydrogen peroxide in a crystalline form.[11]

Ozone gas can also be used for retrobrighting and is simple, as long as an ozone generator and a resealable plastic bag of sufficient size are available, but takes longer than with hydrogen peroxide and other methods.[11]

References
  1. Ángel Jiménez de Luis (May 25, 2010). "Retr0bright lava más blanco" [Retr0bright washes more white]. El Mundo. Archived from the original on September 21, 2017. Retrieved September 21, 2017.
  2. Yousif, E.; Haddad, R. (August 23, 2013). "Photodegradation and photostabilization of polymers, especially polystyrene: review". SpringerPlus. 2: 398. doi:10.1186/2193-1801-2-398. PMC 4320144. PMID 25674392.
  3. "Forum64 — Restaurierung eines C-64G, oder das Gastgeschenk des DOC64". February 19, 2007. Archived from the original on August 20, 2018. Retrieved August 21, 2018.
  4. "The "Retr0bright" Project". July 28, 2010. Archived from the original on September 4, 2010. Retrieved August 21, 2018.
  5. Doctorow, Cory (March 2, 2009). "Open source computer polish: Retr0Brite". Boing Boing. Archived from the original on September 21, 2017. Retrieved September 21, 2017.
  6. Mossesgeld, Rico (July 28, 2010). "How To Restore Your Beige Retro Hardware". Tom's Guide. Tom's Hardware. Archived from the original on August 20, 2018. Retrieved September 21, 2017.
  7. Stewart, Terry (January 17, 2013). "Retr0Bright (or RetroBright) treated plastics re-yellowing even with minimal light exposure?" (published January 15, 2013). Archived from the original on September 6, 2017. Retrieved September 21, 2017.
  8. Petersen, Anja Liss (January 19, 2011). "Afrensning af plast med RetrObright" [Plastic cleaning with RetrObright] (in Danish). Archived from the original on April 2, 2015. Retrieved September 21, 2017.
  9. Flood, David (April 14, 2018). "A Look into the Yellowing and Deyellowing of ABS Plastics". Archived from the original on September 30, 2021. Retrieved September 30, 2021.
  10. Maushammer, John (March 2, 2009). "Un-Yellow Old Plastics – Retr0brite!". Make:. Archived from the original on September 21, 2017. Retrieved September 21, 2017.
  11. Murray, David (20 August 2017). "Adventures in Retrobrite - New techniques for restoring yellowed plastic!". YouTube. The 8-Bit Guy. Archived from the original on 1 December 2019. Retrieved 26 November 2019.
  12. Retr0bright - de-yellowing do's, dont's, and playing devil's advocate. Modern Classic. Jul 14, 2017. Archived from the original on 2021-12-15. Retrieved September 20, 2018.
  13. Narcisse, Evan (September 24, 2014). "The Secret To Keeping Old Consoles Looking New? Hair Product". Kotaku. Archived from the original on May 15, 2017. Retrieved September 21, 2017.
  14. Murray, David (April 6, 2013). How to fix yellowed plastics on old computers!. The 8-Bit Guy. Archived from the original on 2021-12-15. Retrieved May 29, 2017.
  15. "How Retrobright Works! - The Geek Pub". The Geek Pub. May 27, 2018. Archived from the original on May 28, 2018. Retrieved May 27, 2018.
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