New Mexico Cosmetology Practice Exam

What is considered a safe pH range for salon products?

1. pH 2 to 4

2. pH 3 to 5

3. pH 4 to 7

4. pH 8 to 10

The correct answer is: pH 4 to 7

A pH range of 4 to 7 is considered safe for salon products, especially those used on the skin and hair. This range is close to the natural pH of human skin, which typically falls between 4.5 and 5.5. By formulating products within this range, it helps maintain the natural barrier of the skin and hair, preventing irritation or damage that can occur with products that are more acidic or alkaline. Products outside this pH range, such as those with a pH of 2 to 4 or 8 to 10, can disrupt the skin’s protective barrier and lead to adverse effects. Highly acidic products can strip the hair of its natural oils, leading to dryness and brittleness, while alkaline products can cause the hair to swell and weaken, resulting in breakage and frizz. Therefore, a balanced pH of 4 to 7 is crucial for ensuring that salon products work effectively while maintaining the health and integrity of hair and skin.