The combination of hydrogen peroxide and which item will allow lift and lightening of the hair's natural color?

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Multiple Choice

The combination of hydrogen peroxide and which item will allow lift and lightening of the hair's natural color?

Explanation:
Lift and lightening come from an oxidizing agent working in an alkaline environment. Hydrogen peroxide provides the oxidation, but to let it reach the cortex and break down natural pigment, the cuticle must be opened by raising the pH. Ammonia raises the pH, swells and opens the cuticle, and allows peroxide to penetrate so melanin can be oxidized, resulting in lighter hair. The other options don’t supply that lifting mechanism: a relaxer straightens by breaking disulfide bonds, pigment adds color, and shampoo doesn’t oxidize or lift color.

Lift and lightening come from an oxidizing agent working in an alkaline environment. Hydrogen peroxide provides the oxidation, but to let it reach the cortex and break down natural pigment, the cuticle must be opened by raising the pH. Ammonia raises the pH, swells and opens the cuticle, and allows peroxide to penetrate so melanin can be oxidized, resulting in lighter hair. The other options don’t supply that lifting mechanism: a relaxer straightens by breaking disulfide bonds, pigment adds color, and shampoo doesn’t oxidize or lift color.

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