California Cosmetology Practice Exam

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Prepare for your California Cosmetology State Board Exam with our comprehensive practice test. Featuring flashcards, multiple-choice questions, each with hints and explanations to reinforce your knowledge and confidence.

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What is the pH value range of human hair?

3.0 to 4.0
4.5 to 5.5
5.5 to 6.5
6.0 to 7.0

The correct answer is: 4.5 to 5.5

The pH value range of human hair typically falls between 4.5 and 5.5. This slightly acidic pH level helps maintain the health of hair by promoting the natural barrier function of the hair cuticle, which protects against damage and prevents moisture loss. The acidity of this pH range also aids in the structural integrity of the hair, allowing it to remain vibrant and resilient. Furthermore, hair care products are often formulated to align with this pH range to ensure compatibility and effectiveness in cleansing and treating hair without causing damage or irritation.