Omar Khalid
There are several methods to whiten plastic, including using lemon juice, bleach, and vinegar. One popular method is to use hydrogen peroxide, a chemical that can be purchased at pharmacies and hardware stores. The process, known as retro-brighting, involves soaking the plastic in 3% hydrogen peroxide for 3-4 hours, then placing it in direct sunlight or under a UV lamp for several hours. This method is especially effective for small items like phone cases and Lego pieces. However, it may require multiple attempts and can cause an ugly bleaching effect if the solution dries up.
Characteristics and Values Table for Whitening Plastic with Hydrogen Peroxide
| Characteristics | Values |
|---|---|
| Type of Hydrogen Peroxide | Cream |
| Strength of Hydrogen Peroxide | 3%, 6%, 9%, 12% |
| Amount of Hydrogen Peroxide | Enough to cover the plastic |
| Type of Plastic | Yellowed, stained, discoloured |
| Plastic Items | Lego, toys, utensils, containers, bowls, plates, electronic devices, appliances, phone cases, computer casing, game consoles |
| Additional Items | UV light source (UV lamp or sunlight), plastic container, cling wrap, brush, gloves, safety goggles, toothbrush, soap, running water |
| Procedure | Soak plastic in hydrogen peroxide for 3-4 hours. For electronic devices, remove plastic pieces and soak. For items that cannot be soaked, scrub with a brush or toothbrush. Place in sunlight or under a UV lamp. Turn over or rotate the items regularly. Rinse with water and wash with soap if necessary. |
| Time Taken | A few hours to a few days |
| Cost | $1 for 3% hydrogen peroxide at Target. $1.50 for 75ml of 12% hydrogen peroxide on Amazon. |
| Notes | Do not let the cream peroxide dry up, especially under the sun, as it will cause irreversible bleaching. The process may need to be repeated multiple times to achieve the desired result. |
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What You'll Learn
Soak plastic in 3% hydrogen peroxide for 3-4 hours
To whiten plastic with hydrogen peroxide, start by purchasing 3% hydrogen peroxide from a pharmacy.
If you are cleaning an electronic device or appliance, remove the plastic pieces and then soak them in the hydrogen peroxide. Remove any non-plastic parts from the item you are treating before putting it into the hydrogen peroxide.
Fill a plastic bag or container with enough hydrogen peroxide to cover the plastic. Stick the plastic item in the hydrogen peroxide and set it out in direct sunlight. Wait 3-4 hours before rinsing it off with clean water.
You can also use an old toothbrush to scrub the hydrogen peroxide onto the plastic. If you are cleaning a bowl, fill it up with hydrogen peroxide. If it is a plate, find a tub big enough to hold the plate and cover it with hydrogen peroxide.
For best results, use a UV lamp indoors or place the plastic in the sun. Turn over the plastic pieces after a few hours and expose them to UV light again.
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Use a UV lamp or sunlight
To whiten plastic with hydrogen peroxide, you will need a UV lamp or sunlight. The UV rays from the lamp or sun will interact with the hydrogen peroxide to whiten the plastic.
The UV lamp method is more suitable if you are unable to keep checking on the progress of your plastic whitening process. If you use a UV lamp, be sure to wear protective goggles, as UV rays can damage the eyes. Keep the area well-ventilated to avoid high ozone concentration.
If you are only going to be whitening plastic once or twice, the sun is a perfect source of UV light. Place your plastic items in a sunny spot, ensuring that all sides are exposed to the sunlight. You can leave the items on a table by the window, turning them regularly to expose all sides to the sun.
The sunning process can take anywhere from a few hours to a few days, depending on the severity of the yellowing. For example, one source suggests leaving plastic items in the sun for 3-4 hours to remove discoloration and stains. Another source suggests leaving items in the sun for 4 hours with a small amount of Vanish O2 as an activator.
If you are using a UV lamp, you will need to check the progress regularly and turn the plastic pieces over to ensure that all sides are exposed to the UV light.
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Make a Retr0Bright gel
Safety Precautions:
Before we get into the specifics of making the Retr0Bright gel, it's important to understand the potential dangers of working with hydrogen peroxide. It can be corrosive and cause severe chemical burns to the skin and even blindness if it comes into contact with your eyes. Always wear protective gear, such as goggles, gloves, and old clothes when handling these chemicals. Keep pets and children away from the work area, and do not ingest or touch your eyes after handling hydrogen peroxide.
Ingredients:
- Hydrogen Peroxide: Available at pharmacies, hairdressers' supplies, or online. For the gel, you can use a range of concentrations, from 6% to 30%, depending on the recipe you follow.
- Xanthan Gum or Arrowroot: Used as a thickening agent to create the gel consistency. Available at health food shops or online.
- Glycerine: Available at pharmacies.
- "Oxy" or "Oxi-Magic" Laundry Booster: A small amount is used as a catalyst in the whitening process.
- Distilled Water: Used in some recipes to dilute the hydrogen peroxide.
Mixing Instructions:
There are several variations of the Retr0Bright gel recipe, but here's a general guide:
- Mix Hydrogen Peroxide and Xanthan Gum or Arrowroot: In a blender, mix the hydrogen peroxide with the thickening agent (Xanthan Gum or Arrowroot) for 5 seconds. The amount of each ingredient may vary depending on the recipe you follow.
- Add Glycerine: Add the glycerine to the mixture and blend for another 5 seconds.
- Dissolve "Oxy" or "Oxi-Magic": In a separate container, dissolve the laundry booster in hot (not boiling) water. This step improves the solubility of the booster in the gel.
- Combine the Mixtures: Let the gel mixture rest for a minute, then blend again for 5 seconds. Just before use, thoroughly stir in the dissolved laundry booster mixture.
- Store and Apply: Store the gel in a dark-coloured jar or a UV-resistant container. When ready to use, apply the gel to the plastic surface and follow the standard Retr0Bright instructions.
Recipe Variations:
- Tezza's Arrowroot Variant: This recipe uses arrowroot instead of Xanthan Gum and omits glycerine. It may dry out faster but is easier to find and a workable alternative.
- Lorne's Variant: This recipe uses stronger hydrogen peroxide (30%) and includes hot water to dissolve the "Oxy" booster.
- Thomas Fuchs' Method: Fuchs suggests using 3% hydrogen peroxide with distilled water, partially covering the container, and exposing it to sunlight for several hours.
Always follow safety precautions and experiment with different recipes to find the one that works best for you.
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Bleach as an alternative
Using bleach is another way to whiten plastic. This method is considered to yield better results than using hydrogen peroxide because the NaClO produces a different chemical reaction, effectively dyeing the plastic white. However, bleach will also damage printing because it dyes the inks used to pad print onto plastic bricks.
To whiten plastic with bleach, mix equal parts water and bleach in a container and let it sit overnight. Rinse the plastic item with soap and water after soaking it in the bleach solution. It is important to test the bleach on a small section of the plastic first to ensure it does not damage the material. When working with bleach, it is crucial to wear protective gear, such as a respirator mask, gloves, and goggles, and to work in a well-ventilated area.
For stubborn stains, some recommend letting the bleach solution sit for 1-2 hours instead of overnight. After rinsing the bleach solution, place the plastic item outside in the sun for two full days to help remove any remaining stains and reduce the smell of bleach.
Another alternative to bleach is to use baking soda and dish soap. Form a paste with baking soda and water, and rub it onto the plastic in circular motions. Once clean, wash the item with soapy water, rinse it with water, and dry it with a towel. This method is safer for children's toys, as it does not involve the use of harsh chemicals.
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Use lemon juice
Lemon juice can be used to whiten plastic. It is a natural stain remover and can be used on plastic containers, cups, and other items.
To use lemon juice to whiten plastic, cut a lemon in half and rub it on the stained area. Make sure to get into the nooks and crannies of the stained plastic. Allow the lemon juice to soak into the stain for 15 minutes to a few hours. For tougher stains, it is recommended to let the lemon juice sit for longer. You can also leave the item in the sun while the lemon juice soaks in, as the sun will enhance the whitening effect.
After allowing the lemon juice to soak in, rinse the plastic item with water and dish soap. If the stain is still visible, you can sprinkle some table salt on a damp dishcloth and use it to scrub the stain. Lemon juice can also be mixed with salt to create a scouring paste, which can be used to scrub the stain before rinsing.
Lemon juice is an effective way to remove yellow stains from plastic caused by food, sunlight, or chemical reactions. However, it is important to note that lemon juice may not be suitable for all types of plastic, as some sources suggest that it can dissolve certain types of plastic or leave abrasions.
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Frequently asked questions
The Retr0Bright method involves using 6-12% hydrogen peroxide and a source of UV light. You can use a UV lamp or sunlight. Soak the plastic in the hydrogen peroxide for 3-4 hours, then rinse it off with clean water.
UV light reacts with hydrogen peroxide to generate hydroxyl radicals, which restore the original colour of the plastic.
A 50ml bottle of 12% hydrogen peroxide solution costs $4.90. A lower strength of 6% will also work, but it will take longer.
