A single process refers to any color service that is done in one step. ... This is generally a permanent color that is applied either jus to the roots or all over from roots to ends. a single process can also be a demi-permanent color or a glaze, which is a type of color that only deposits color into the hair.

How long does single process color last?

A single-process color (one color all over) should be touched up generally every six weeks, whereas a highlight could last up to three months.

What is single process color vs Double?

What is single process color versus double process color? A single process can mean an all-over color or a touch up. Double process is when two processes are done in one service, such as highlights and then toning, or a single process color with a gloss.