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Multiple Choice

What is the common pH range for a salon?

Understanding pH helps explain why salons use mildly acidic products. The pH scale measures how acidic or basic a substance is; lower numbers mean more acidic. Hair and scalp respond best when products keep the cuticle closed and the scalp comfortable, which is achieved with formulas in the mildly acidic range. That’s why many salon shampoos, color products, and styling aids are formulated around pH 3 to 5.5. Very acidic products (1–3) can be harsh and irritating; neutral (6–7) is not as effective at keeping the cuticle closed; alkaline (8–9) tends to lift the cuticle, leading to more frizz, damage, and faster color fading. So the common range for salon products is about 3–5.5.

Understanding pH helps explain why salons use mildly acidic products. The pH scale measures how acidic or basic a substance is; lower numbers mean more acidic. Hair and scalp respond best when products keep the cuticle closed and the scalp comfortable, which is achieved with formulas in the mildly acidic range. That’s why many salon shampoos, color products, and styling aids are formulated around pH 3 to 5.5. Very acidic products (1–3) can be harsh and irritating; neutral (6–7) is not as effective at keeping the cuticle closed; alkaline (8–9) tends to lift the cuticle, leading to more frizz, damage, and faster color fading. So the common range for salon products is about 3–5.5.