Bleach: Chemical change because the hydrogen peroxide is reacting with the melanin (the part of the hair that gives it the color). Bleaching removes hair color through the process of oxidation. Hair bleach is a chemical reaction between melanin (the material in hair that gives it color) and hydrogen peroxide. Hair bleaching typically uses chemicals such as hydrogen peroxide or ammonium hydroxide. Physical property can be observed and measured without any changes in molecular composition. Temporary hair dye washes out, so it is a physical change. It is most definatley chemical - here is the chem. when you bleach your hair it is a chemical change,because you are adding the chemical from the bleach to your hair and "you can't change it back to the old". The bleach reacts with the melanin in hair, removing the color in an irreversible chemical reaction. bleaching your hair, lighting a match letting fruit rot are chemical changes (chemical reactions), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change. Check the ingredients if you’ve used a drugstore brand hair color to make sure it doesn’t contain any metallic dye components. 12. Bleach is used to lighten hair. The bleach oxidizes the melanin molecule. It turns out that when you bleach your hair, you are changing the chemical composition of the hair: Hair bleaching is the process of removing the pigment from the hair strand. Quite … Hair Colors. However, bleached hair … Finally, hair bleaching relies on chemicals to be effective. Protective styles are a great option if you want to test a by aimee simeon It uses hydrogen peroxide to break down hair’s natural color, then the peroxide also oxidizes a polymeric reaction with dye … Stylists also use chemical … Hydrogen peroxide oxidizes the hair's pigment, stripping away the melanin and, as a result, … Dramatic changes in hair color often require bleaching to strip the hair of the natural or artificial color and allow the hair to absorb the new color. Hair coloring is a slightly more complicated version of hair bleach. chemical change: bleaching your hair: chemical change: poouring milk on your cereal: physical change: buring leaves: chemical change: corroding metal: chemical change: freezing chocolate covered bananas: physical change: making salt water to gargle with: physical change: separating sand from gravel: physical change: 1. The melanin is still present, but the oxidized molecule is colorless. 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