To prevent your mangas from yellowing, it's important to store them in a cool, dry, and dark environment to minimize exposure to light and humidity. Avoid placing them in direct sunlight or near heat sources. Additionally, using acid-free and archival quality materials for storage, such as acid-free plastic sleeves or boxes, can help prevent yellowing. Finally, handling your mangas with clean hands and avoiding eating or drinking while reading them can also help prevent yellowing. **

To remove plastic yellowing, you can try using a mixture of hydrogen peroxide and a small amount of UV light. First, mix the hydrogen peroxide with a small amount of water and apply it to the yellowed plastic. Then, expose the plastic to UV light, such as sunlight or a UV lamp, for several hours. This process can help to break down the chemical bonds that cause the yellowing and restore the plastic to its original color. Additionally, you can also try using a plastic polish or rubbing compound specifically designed for removing yellowing from plastic surfaces. **

To help with yellowing after bleaching, you can use a purple or blue toning shampoo to neutralize the yellow tones and restore a cooler, more natural blonde color. Additionally, using a deep conditioning treatment can help to nourish and hydrate the hair, reducing the appearance of yellowing and improving overall hair health. It's also important to avoid excessive heat styling and use heat protectant products to prevent further damage and discoloration. **

To protect books from yellowing, it's important to store them in a cool, dry, and dark environment to prevent exposure to sunlight and humidity. Using acid-free and archival quality materials for book covers, storage boxes, and protective sleeves can also help prevent yellowing. Additionally, handling books with clean hands and avoiding eating or drinking while reading can prevent oils and stains from damaging the pages. Regularly dusting and cleaning bookshelves can also help maintain the condition of the books. **

Yellowing on a metal bed can be caused by a variety of factors, including exposure to moisture, sunlight, or chemicals. Oxidation of the metal can also lead to discoloration over time. Additionally, if the metal bed is made of a lower quality material or has a thin coating, it may be more prone to yellowing. Regular cleaning and maintenance can help prevent or reduce yellowing on a metal bed. **

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As an AI, I don't have personal feelings, but I can tell you that the yellowing of books is a natural process that occurs over time due to the breakdown of the paper and exposure to light and air. While some people may find it bothersome, others see it as a sign of a book's history and character. Ultimately, the yellowing of books is a natural part of their aging process and can be seen as a reminder of the passage of time. **

To remove yellowing from Lego bricks, you can try soaking them in a mixture of hydrogen peroxide and water for a few hours. Another method is to use a mixture of baking soda and hydrogen peroxide to create a paste, which can be applied to the yellowed areas and scrubbed gently with a soft brush. Additionally, exposing the Lego bricks to direct sunlight for a few hours may also help to reduce yellowing. **