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Can you lighten bleached and dyed hair with hydrogen peroxide?

Hydrogen peroxide can be used to lighten hair, but it can be damaging if not used correctly. It is important to note that using hydrogen peroxide to lighten bleached and dyed hair can be unpredictable, and the results may vary depending on the current state of the hair.

Hydrogen peroxide is a strong oxidizing agent that can bleach hair by breaking down the melanin in the hair shaft.

However, if the hair has already been bleached or dyed, it may have already undergone chemical processing, which can make it more fragile and prone to damage.

Additionally, using hydrogen peroxide on hair that has already been bleached or dyed can lead to uneven results, as the peroxide may not lighten the hair evenly. It is also possible that the peroxide could strip the hair of its natural oils, which can leave it dry, brittle, and prone to breakage.

If you are looking to lighten your hair, it is generally recommended that you visit a professional stylist who can assess the current state of your hair and use the appropriate techniques and products to achieve the desired result while minimizing damage.

How does hydrogen sulphide bleach hair?

Hydrogen sulfide (H2S) is not a commonly used hair bleach. It is a toxic gas with a characteristic “rotten egg” smell and is not typically used in hair products. However, hydrogen peroxide (H2O2) is a commonly used hair bleach, and it is possible that you may have meant to ask about the effects of hydrogen peroxide on hair.

When hydrogen peroxide is applied to hair, it reacts with the melanin pigment in the hair shaft, breaking it down and lightening the color of the hair. The reaction between hydrogen peroxide and melanin is an oxidation reaction, where the peroxide oxidizes the melanin molecules, causing them to break down into smaller colorless molecules.

The concentration of hydrogen peroxide used in hair bleaching products can vary depending on the desired level of lightening and the condition of the hair. Higher concentrations of hydrogen peroxide can produce more dramatic lightening results, but can also be more damaging to the hair.

The process of hair bleaching can be further enhanced by the use of heat, such as a hair dryer or a specialized heat lamp, which can speed up the oxidation reaction and produce more consistent results. After bleaching, it is important to take steps to restore moisture and nourishment to the hair, as the bleaching process can strip the hair of its natural oils and leave it dry and brittle.

It is worth noting that hydrogen peroxide is not the only chemical used in hair lightening products, and there are other chemicals that can be used to bleach hair, such as ammonia and bleach powder. However, these chemicals can be even more damaging to the hair than hydrogen peroxide, and should be used with caution.

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