Outline the three main types of color services and their key processing differences.

• A. Permanent (oxidative; lasting), demi-permanent (slightly oxidative; fades), semi-permanent (no oxidation; fades quickly).
• B. Demi-permanent; Semi-permanent; Temporary.
• C. Permanent; Temporary; Demi-permanent.
• D. Temporary; Semi-permanent; Permanent.

Answer: (A)

The main idea here is how color services differ by oxidation and how long the color lasts. Permanent color uses an oxidative process with a developer; it penetrates the cortex, so the color is durable and remains until new hair grows out or is reprocessed. Demi-permanent colors use a milder oxidation step, depositing color and sometimes offering a small amount of lift, but they fade gradually with washing and don’t lift significantly. Semi-permanent colors have no oxidation, so they sit on the cuticle and wash out relatively quickly, giving temporary depth or tone without changing the underlying base. This combination—oxidative and lasting for permanent, slightly oxidative and fading for demi-permanent, and no oxidation with rapid fading for semi-permanent—captures the three main types and their processing differences. Other groupings either omit a type or misstate whether oxidation occurs and how long the color lasts.