Hydroquinone (hydroquinone)
Hydroquinone is a cosmetic component of restricted substances, the maximum allowed in cosmetics concentration of 2%, allowing the use of the scope and limits are used in oxidation hair colorants. Acute toxicity of hydroquinone is mainly caused leukopenia hematopoietic changes. After contact cosmetic bottle with an alkaline solution of hydroquinone who had found cases of dermatitis, contact with the free hydroquinone can reduce skin pigmentation, can reappear after cessation of exposure, long-term exposure can be seen with hydroquinone skin redness, cessation of exposure can be gradually restored . Animal experiments show that the acetone solution applied to the skin daily, hydroquinone, 20.0mg amount of time to produce skin cancer, so as freckles and the hydroquinone is a certain risk of fungicides. Hydroquinone intermediate is one of the major human metabolite of benzene lipstick containers produced by the metabolism, these metabolites are directly related to the nature of benzene benzene-induced tumors such as leukemia. One of the most effective substances hydroquinone or benzene metabolite inhibiting DNA synthesis. Further 1 - methyl hydroquinone, and 2 - methyl hydroquinone with ultraviolet absorbing properties, so it is possible to use as a sunscreen, animal performance, which slows down the growth of the two compounds occurs.Improper use of cosmetics can cause allergies, many people have encountered improper use of cosmetics annoyance. In fact, the cosmetic skin allergy test method is very simple, first with a cloth soaked in distilled water or physiological saline, plastic jar containers half twist to dryness and folded in 4 layers of about 1 cm square size, the cosmetic coating side of the cloth, and then deposited on the forearm on the inside or back to normal skin, then covered airtight cellophane or plastic film to tape securely. After 24 to 48 hours of observation, if the test site without any symptoms, it indicates that the cosmetic skin irritation, safer. If the test of the drama weary or burning, indicating that the cosmetic skin irritation, suggesting that cosmetics must not use the test substance should be promptly removed, rinse with water.
Hydroquinone is a cosmetic component of restricted substances, the maximum allowed in cosmetics concentration of 2%, allowing the use of the scope and limits are used in oxidation hair colorants. Acute toxicity of hydroquinone is mainly caused leukopenia hematopoietic changes. After contact cosmetic bottle with an alkaline solution of hydroquinone who had found cases of dermatitis, contact with the free hydroquinone can reduce skin pigmentation, can reappear after cessation of exposure, long-term exposure can be seen with hydroquinone skin redness, cessation of exposure can be gradually restored . Animal experiments show that the acetone solution applied to the skin daily, hydroquinone, 20.0mg amount of time to produce skin cancer, so as freckles and the hydroquinone is a certain risk of fungicides. Hydroquinone intermediate is one of the major human metabolite of benzene lipstick containers produced by the metabolism, these metabolites are directly related to the nature of benzene benzene-induced tumors such as leukemia. One of the most effective substances hydroquinone or benzene metabolite inhibiting DNA synthesis. Further 1 - methyl hydroquinone, and 2 - methyl hydroquinone with ultraviolet absorbing properties, so it is possible to use as a sunscreen, animal performance, which slows down the growth of the two compounds occurs.Improper use of cosmetics can cause allergies, many people have encountered improper use of cosmetics annoyance. In fact, the cosmetic skin allergy test method is very simple, first with a cloth soaked in distilled water or physiological saline, plastic jar containers half twist to dryness and folded in 4 layers of about 1 cm square size, the cosmetic coating side of the cloth, and then deposited on the forearm on the inside or back to normal skin, then covered airtight cellophane or plastic film to tape securely. After 24 to 48 hours of observation, if the test site without any symptoms, it indicates that the cosmetic skin irritation, safer. If the test of the drama weary or burning, indicating that the cosmetic skin irritation, suggesting that cosmetics must not use the test substance should be promptly removed, rinse with water.
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