Hairstylists and colorists applying permanent or semi-permanent color, lightener, or toner during a salon service, as well as home users mixing and applying their own box color who want more precise placement than the bottle applicator alone provides.

It's a simple, purpose-built applicator rather than a multi-feature tool — a color brush's main job is precise, even product placement, and using synthetic rather than natural bristles means it won't degrade the way a natural-hair brush would after repeated exposure to bleach and oxidative color.

• Mix the hair color, lightener, or toner according to that product's own instructions in a bowl or applicator bottle.
• Load the tip of the brush with product and apply to sectioned hair, working in thin, even sections from root to end or scalp to mid-shaft depending on the technique.
• Rinse the brush immediately in warm water with a mild soap after use to prevent product from drying and staining the bristles.

Pros:

• Low cost makes it easy to keep several on hand for multi-color or multi-client work
• Synthetic bristles hold up to repeated contact with oxidative color and lightener without breaking down the way natural bristle would
• Tapered tip allows for sectioning and precise placement at the hairline and roots

Cons:

• Basic single-brush design with no cushioned grip or ergonomic handle
• Bristles can retain and stain from pigmented color if not rinsed promptly after use
• Not built for heavy, wide-area application the way a broader paddle brush is