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What is the layer of the hair that needs to be penetrated for the hair to absorb color?

  1. Arrector pili muscle

  2. Hydrogen bonds

  3. Cuticle layer

  4. Sulphur bonds

The correct answer is: Cuticle layer

The layer of hair that needs to be penetrated for the hair to absorb color is the cuticle layer. This is the outermost layer of the hair shaft, made up of overlapping scales that protect the inner layers of the hair. The arrector pili muscle and hydrogen bonds are not relevant to the absorption of hair color. The arrector pili muscle is responsible for goosebumps and the raising of hair follicles, while hydrogen bonds are involved in the hair's shape and texture. Sulphur bonds play a role in hair color by giving it strength and elasticity, but they are not the primary layer that needs to be penetrated for color absorption. Therefore, the correct answer is the cuticle layer.