Chloe Zhang
There are several ways to whiten yellowed plastic. One method involves submerging the plastic in hydrogen peroxide and placing it under bright sunlight or UV lights. Another method is to apply a cream containing hydrogen peroxide to the surface of the plastic and cover it with plastic wrap. Leaving the plastic outside in the sun for a couple of days can also help to whiten it, and wearing gloves during the process is recommended. Other suggested methods include using ammonia, alcohol, lemon juice, vinegar, soda crystals, or melamine sponges.
How to Whiten Yellowed Plastic
| Characteristics | Values |
|---|---|
| Cause of Yellowing | Exposure to UV rays from the sun |
| Reason | Bromine used in manufacturing makes its way to the surface |
| Solution 1 | Submerge plastic in hydrogen peroxide and place under bright sunlight or UV lights |
| Solution 2 | Use Retrobrite: paint plastic with hydrogen peroxide cream, then cover with plastic wrap |
| Solution 3 | Spray with lemon juice and leave in the sun |
| Solution 4 | Clean with ammonia (wear gloves and a mask, do not mix with bleach) |
| Solution 5 | Clean with alcohol (but not too much or it may damage the plastic) |
| Solution 6 | Clean with a melamine sponge soaked in diluted vinegar |
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Hydrogen peroxide and UV light
Retrobright is a hydrogen peroxide-based process for removing yellowing from plastics, specifically ABS plastics. ABS plastics turn yellow when exposed to UV light or excessive heat, causing photo-oxidation of polymers that break polymer chains and make the plastic brittle.
To use this method, carefully apply a cream made from hydrogen peroxide, a small amount of the "active oxygen" laundry booster TAED as a catalyst, and a source of UV light. Xanthan gum or arrowroot can be added to the solution to create an easier-to-apply gel. The cream must be wrapped with plastic wrap to avoid streaks.
After applying the cream, expose the plastic to UV light. This can be done by placing the plastic in direct sunlight or under a UV lamp. The time required for the whitening process can vary from a few hours to a few days, depending on the severity of the yellowing.
It is important to note that hydrogen peroxide can be expensive, and the amount needed will depend on the size of the item being treated. Additionally, care must be taken to prevent the cream from drying up, especially under the hot sun, as this can cause an irreversible bleaching effect.
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Ammonia
Prepare the Workspace and Gather Materials:
Before you begin, ensure you have the necessary materials, including ammonia, gloves, and a mask. Ammonia can be dangerous when mixed with other products, especially bleach, so always wear protective gear and work in a well-ventilated area.
Clean the Plastic Surface:
Start by cleaning the plastic surface to remove any dust, dirt, or debris. You can use a mild detergent or soap and a soft cloth to gently wipe down the plastic. Rinse the plastic with water and allow it to dry thoroughly before proceeding to the next step.
Apply Ammonia:
Put on your gloves and mask. Carefully pour ammonia into a container or directly onto a clean cloth. Apply the ammonia to the yellowed plastic, ensuring to cover all the affected areas. You can gently rub the ammonia into the plastic with the cloth.
Allow Ammonia to Work:
Let the ammonia remain on the plastic for a few minutes. The duration may vary depending on the severity of the yellowing and the concentration of the ammonia. Always refer to the instructions on the ammonia product you are using.
Rinse and Dry:
After the desired amount of time, rinse the plastic with water to remove any residual ammonia. Ensure to thoroughly rinse all surfaces of the plastic. Finally, allow the plastic to air dry, or you can gently wipe it down with a soft, absorbent cloth.
Safety Precautions:
Always exercise caution when working with ammonia. Ensure the workspace is well-ventilated, and avoid mixing ammonia with other chemicals, especially bleach. Keep ammonia out of reach of children and pets.
By following these steps and taking the necessary safety precautions, you can effectively use ammonia to whiten yellowed plastic.
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Alcohol
If you want to whiten yellowed plastic using alcohol, you can use either rubbing alcohol or hand sanitiser.
If you are cleaning a plastic appliance, utensil, or toy, pour the rubbing alcohol into a container and put the piece of plastic inside. Make sure the alcohol covers the yellowed area. Leave it to work for about 10 to 15 minutes. Then, pour out the alcohol and wash the container in hot, soapy water.
If you don't have enough alcohol to fill the container, line it with paper towels soaked in the rubbing alcohol.
For items you can't soak, scrub them with a paste made from baking soda.
You can also use hand sanitiser if you don't have rubbing alcohol.
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Lemon juice and sunlight
To start, cut a lemon in half and rub the lemon over the plastic so that the juice covers the stains. Make sure to spread the lemon juice into any nooks and crannies of the plastic. Then, place the plastic item outside in direct sunlight for a few hours or even a full day. Finally, rinse the item with water and dry it.
This method works well for smaller items, but it may be less effective for larger items that cannot be easily transported outside or fully covered in lemon juice. Additionally, it is important to note that while sunlight helps remove yellow stains, prolonged exposure to sunlight can also contribute to the yellowing of plastic over time. Therefore, it is recommended to protect plastic surfaces from sunlight to maintain their whiteness.
Overall, using lemon juice and sunlight is a simple and cost-effective way to remove yellow stains from plastic items and restore them to their original appearance.
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Vinegar
To use vinegar to whiten yellowed plastic, start by mixing one part white vinegar with one part water in a container. Submerge the plastic item in the vinegar mixture and let it soak for 2-3 hours. If you are removing stains from a plastic container, simply pour the vinegar mixture inside it. After soaking, rinse the plastic item with soap and water. The vinegar smell will disappear once the plastic is washed and left to dry.
For items that cannot be soaked, such as electronics or old game consoles, you can use a different method. Wet a Magic Eraser with vinegar and wring it out. Scrub the yellowed plastic with the vinegar-soaked Magic Eraser, dipping and wringing it out as needed. Continue to scrub until the stains are removed. Finally, wipe down the plastic with a dry towel.
It is important to note that vinegar may not be as effective as some other methods, such as hydrogen peroxide, in removing severe yellowing or discolouration. Additionally, this method may require multiple applications to achieve the desired results.
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Frequently asked questions
There are several methods to whiten yellowed plastic. One involves submerging the plastic in hydrogen peroxide and placing it under UV light or in direct sunlight for a couple of days. Another method is to apply a thick coat of hydrogen peroxide cream to the plastic and cover it with plastic wrap.
Some products that can be used to whiten yellowed plastic include ammonia, alcohol, lemon juice, diluted vinegar, and RetroBrite.
The yellowing of plastic is caused by polymer degradation, which occurs when bromine, used in the manufacturing process of old ABS plastics, makes its way to the surface.
When working with ammonia, it is important to wear gloves and a mask, and to avoid mixing it with other products, especially bleach. It is also recommended to wear gloves when handling hydrogen peroxide and to avoid excessive use of alcohol as it can craze the plastic.
