What are two types of haircolor applications?

Permanent and semi-permanent hair color applications are fundamental techniques in hair coloring. Permanent hair color involves the use of chemical compounds that penetrate the hair shaft, allowing for long-lasting results. This type of application permanently alters the hair's color until it grows out or is cut off. It is typically used for significant color changes or covering gray hair.

On the other hand, semi-permanent hair color does not involve a chemical process that permanently changes the hair structure. Instead, it temporarily coats the hair cuticle and can last from several washes to a few weeks, depending on the formula used. Semi-permanent colors are a great option for those who want to experiment with color without a long-term commitment, as they gradually fade and are easily removable with shampooing.

While the other options present various techniques and trends within hair coloring, they do not encapsulate the foundational categories of haircolor applications like permanent and semi-permanent do. Highlighting and balayage refer specifically to techniques of applying color to create dimension or a natural look, while dip-dye and ombre are specific styles of color application. Temporary and gel are not standard classifications for long-lasting color applications and are more about cosmetic effects rather than types of haircolor.