Massachusetts Board of Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The most permanent type of hair dye is commonly referred to as permanent color. This type of hair dye is formulated to penetrate the hair shaft, resulting in a long-lasting change to the hair’s color. Unlike semi-permanent and temporary colors which coat the hair and wash out over time, permanent color alters the natural pigment of the hair, allowing for a more durable and significant change.

Additionally, permanent hair dyes typically have a higher pH level and contain ammonia, which helps to open up the hair cuticle for better color penetration. Once the color is applied, it can last for several weeks to months, depending on factors like hair care practices and how frequently the hair is washed.

In contrast, semi-permanent color usually lasts for about 4-6 weeks, as it gradually washes out without the use of harsh chemicals. Temporary colors are designed for short-term use and can wash out after one or two shampoos. Demipermanent color offers a middle ground, lasting somewhat longer than semi-permanent but still not as long-lasting as permanent colors.

Thus, when considering longevity and the nature of the chemical process used, permanent color stands out as the most enduring form of hair dye.