How To Remove Yellowing From Plastic | 3% H2O2 | Retrobrite ULTIMATE GUIDE

Introduction

This tutorial provides a comprehensive guide on how to remove yellowing from plastic, commonly known as retrobriting. Using hydrogen peroxide (H2O2) and UV light, you can restore vintage items to their original color. This process is particularly useful for retro electronics and other plastic items that have discolored over time.

Step 1: Understand the Causes of Yellowing

• Oxidation: The primary reason plastic turns yellow is due to oxidation, which occurs when the material is exposed to UV light and air over time.
• Material Types: Not all plastics can be restored. This method works best on polycarbonate and ABS plastics, commonly found in retro items.

Step 2: Gather Your Materials

To effectively remove yellowing, you will need the following supplies:

• Hydrogen Peroxide (H2O2):
  • 3% H2O2 for gentle cleaning
  • 12% H2O2 food grade for stronger results
• UV Light: A UV light with a wavelength of 395nm to activate the hydrogen peroxide.
• Xanthan Gum (optional): To create a gel/paste for better application on vertical surfaces.
• Isopropyl Alcohol: For cleaning the surface before treatment.

Step 3: Prepare the Hydrogen Peroxide Solution

• For Liquid Application:
  • Use 3% H2O2 directly on the yellowed areas.
• For Gel Application:
  • Mix 12% H2O2 with xanthan gum to form a thick paste.
  • Apply the paste evenly on the plastic surface.

Step 4: Apply the Solution

• Cleaning: Before applying the hydrogen peroxide, clean the plastic with isopropyl alcohol to remove any dirt and oils.
• Application:
  • Apply the hydrogen peroxide (liquid or gel) generously to the yellowed plastic.
  • Ensure even coverage for optimal results.

Step 5: Expose to UV Light

• Place the treated plastic under the UV light.
• Maintain a distance of around 6-12 inches from the light source.
• Timing: Expose the item for 1 to 3 hours, checking periodically for results.

Step 6: Rinse and Dry

• After UV exposure, rinse the plastic with water to remove any remaining hydrogen peroxide.
• Dry the item completely to prevent water spots.

Step 7: Evaluate Results

• Check the plastic for improvement. If yellowing persists, repeat the process as necessary.
• Note that results can vary based on the severity of yellowing and the type of plastic.

Conclusion

Restoring yellowed plastic using hydrogen peroxide and UV light is an effective method to revive vintage items. Always remember to use protective gear when handling hydrogen peroxide and UV light. For best results, ensure thorough application and consistent monitoring during the process. Happy restoring!