Choosing the right developer is just as important as choosing the right shade, yet it is the step most people rush through. This guide breaks down welloxon 20 vs 30 volume so the developer can be matched to what the hair actually needs.
What a Developer Actually Does
A developer, also called an oxidant, activates the color molecules in the dye and opens the hair cuticle so pigment can deposit evenly. The volume number refers to the strength of hydrogen peroxide in the formula, and different volumes are built for different jobs.
Hair Color Developer 20 Volume
Hair color developer 20 volume is the standard choice for most coloring needs. It provides reliable grey coverage while lifting natural hair color by roughly one to two shades, making it the go-to strength for most Koleston Naturals and Intense shades.
30 Volume Developer Uses
30 volume developer uses are more specific. This strength is used when hair needs to be lifted by two to three shades, when covering very resistant or coarse grey that does not respond well to 20 volume, or when moving to a noticeably lighter shade. It should be used with caution on already damaged or chemically treated hair, since the higher peroxide concentration increases the risk of dryness and breakage.
Which Developer for Grey Hair
The question of which developer for grey hair comes up often, especially for more than 50 percent grey coverage. In most cases, 20 volume is sufficient when paired with the correct Koleston shade. 30 volume is only necessary for particularly coarse or resistant grey strands that do not respond after a full processing time on 20 volume.
Correct Hair Color Developer Ratio
The standard hair color developer ratio for Wella Koleston is a 1:1 mix, one part color to one part developer, measured using the same container. Mixing outside this ratio affects both the final shade and how evenly color develops. The mixture should always be applied immediately after mixing, since it loses strength on contact with air.
A Simple Rule to Remember
Use 20 volume for grey coverage close to natural depth. Move to 30 volume only when lifting more than one shade or dealing with very resistant grey. When in doubt, 20 volume is the safer starting point, since it is gentler on hair structure while still delivering full coverage for most people.
