What are dual purpose hair coloring products that create a color base and equalize excessive porosity called?

Dual purpose hair coloring products that create a color base while also equalizing excessive porosity are known as color fillers. These products help to improve the overall appearance of the hair by ensuring a uniform color application, especially when dealing with porous hair that may absorb color unevenly. By filling in gaps in the hair's cuticle, color fillers prepare the hair for subsequent coloring processes, allowing for better color retention and vibrancy.

Color fillers are specifically formulated to address the issues associated with porous hair, making them essential for achieving optimal coloring results. This unique ability to serve a dual function sets them apart from other products in the hair coloring category, which may serve only one purpose, such as neutralizing unwanted tones or enhancing existing color.