Which pH range indicates an acidic solution?

The pH scale ranges from 0 to 14 and is used to determine whether a solution is acidic, neutral, or alkaline (basic). A pH of 7 is considered neutral, which means it is neither acidic nor basic. When the pH is below 7, the solution is classified as acidic. Thus, a pH range of 0 to 6.9 indicates varying degrees of acidity, with lower numbers reflecting stronger acids. This understanding is crucial in hair coloring, as the pH of a product can significantly influence the hair's condition and the effectiveness of the dye. Solutions with a higher pH can be more damaging to the hair, which is why having knowledge of acidity is important for achieving the desired results while maintaining hair health.