Coloring Gray Hair: Why Gray Won't Take Color and How to Color Resistant Gray

Coloring gray hair relies on a natural shade: gray hair has no pigment, and the color has to replace it. A natural shade of the same level is added to the target shade, and the more gray there is, the larger its share: at 70–100% gray, 2 parts natural to 1 part target shade. Resistant and glassy gray is prepared before coloring with pre-softening, pre-pigmentation or a dense mix with 9% developer. A light color 3–4 levels above the base does not cover gray, it only tones it. [1, 4]

The BCcampus textbook for colorists explains why the percent of gray changes the formula:

“Grey hair tends to be more resistant and requires the replacement of missing melanin.”

— BCcampus

Why won't gray hair take color?

Gray hair produces neither eumelanin nor pheomelanin, the pigments that give hair its dark and warm color. [2] So gray has neither a level nor a tone: the color has to build the depth itself.

Yet gray hair only looks white:

“The white color of canities is an optical effect; the reflection of incident light masks the intrinsic pale yellow color of hair keratin.”

— IJDVL

Under the white stays the yellow color of keratin, and in the medulla there is air: an aging follicle may build more medulla cells than cortex cells, the medulla widens and collapses, and a cavity forms in the center of the gray hair. [2] Because of the yellow and the air, gray takes fashion shades poorly and does not build depth.

The third reason is the cuticle. On resistant gray the scales lie tight, porosity is low, and color gets into the cortex more slowly. So such gray is softened before coloring or the color is left on longer [3]; the processing time on gray is 45 minutes.

A fashion shade without a natural shade gives no depth: straight on gray it comes out see-through, too bright or neon. [3]

Glassy gray and other types of gray hair: the check before coloring

Before coloring, the stylist assesses gray hair by 3 signs, and the ratios, the developer and the preparation depend on them:

1. Percent of gray. Gray hair is a mix of white and pigmented hairs, and the larger the share of white, the more natural shade goes into the formula. [1, 4] By where it grows, gray is diffuse, all over the head, or patchy, in areas.
2. Hair thickness: fine, medium or coarse. Coarse hair needs more dye so there is enough pigment for a solid color. [4]
3. Resistance of the gray: soft, resistant or glassy. Soft gray is colored with 6% developer by the chart below. Resistant and glassy gray resist color, as their cuticle is closed tighter [3], and there are preparation techniques for them.

Why add a natural shade to a fashion shade on gray hair?

Without a natural shade, gray shows through the color:

“Trendy, fashion shades have a tendency to cover less than natural shades making the resulting color too vivid.”

— Goldwell

White hairs show through more than dark ones. In a natural shade the pigments are balanced to replace the melanin that gray hair lacks, and the color evens out on gray and pigmented hairs. [1, 4] The natural shade is taken at the same level as the target shade [4]: natural (/0 or /00) for cool and neutral shades, gold (/3) for warm ones.

For soft gray, the share of the natural shade grows with the percent of gray. The color is mixed with 6% developer at 1:1 and left on for 45 minutes:

The stylist picks the shade number in their own color line.

How to color resistant gray hair: pre-softening, pre-pigmentation and a dense mix

Glassy gray, which takes color poorly, is colored with one of 4 techniques: pre-softening, classic pre-pigmentation, pre-pigmentation with water and a dense mix. Pre-softening opens the cuticle slightly, pre-pigmentation fills the hair with natural pigment in advance, and a dense mix does both in one application. Resistant gray has its own chart, at the end of the section.

Pre-softening gray hair

Pre-softening opens the cuticle before coloring so the color gets into the cortex better. It suits diffuse glassy gray up to 30%.

1. 6% developer without color goes on the gray areas for 10–15 minutes.
2. Meanwhile the color is mixed with 6% developer by the formula for up to 30% gray.
3. Excess moisture is removed with a towel, and the developer is blow-dried completely.
4. The color goes on the still-hot hair: the technique works under this condition.

Classic pre-pigmentation of gray hair

Classic pre-pigmentation fills gray hair with natural pigment before coloring. It is used on glassy gray and suits patchy gray well.

1. A natural shade without developer goes on the gray areas.
2. It is left on for 15–20 minutes and not rinsed out.
3. The color is mixed by the formula for 50% gray. The 6% developer is measured for all the color: in the bowl and already on the hair.
4. This mix goes only on the areas that were pre-pigmented.

Pre-pigmenting lightened hair before a dark color is another job: there the hair gets back the warm background of lightening. It is covered in the article on the hair color filler.

Pre-pigmentation with water

The same filling with pigment, but the natural shade, or gold for warm shades, is diluted with water 1:1.

1. The mix of color and water goes on the gray areas.
2. It is left on for 20 minutes and not rinsed out.
3. The hair is colored by the formula for up to 50% gray with 6% developer; the developer is measured only for the color in the bowl.

A dense mix

A dense mix is a stronger filling of the hair with pigment for more than 50% gray and resistant hair. The color is mixed with 9% developer at 2:1: 9% developer opens the scales, and 2 parts of color fill the hair densely with the shade. How the developer percent changes lift and coverage is covered in the article on hair developer.

How do you color gray hair a light shade?

At levels 8–10, gray is colored with 9% developer: 6% may not lift the hair to the needed level. The natural shade for light tones is 8/00 or 9/0, and an in-between level comes from mixing them. The natural shade and the target shade are taken 1:1, and the color and developer 1:1 too.

The general chart for resistant gray

For resistant gray, the ratios, the developer and the preparation depend on the percent of gray and the level:

The ratios of the natural shade and the target shade are in parts. After the developer percent comes color to developer: 1:1 = equal parts, 2:1 = 2 parts color to 1 part developer. The processing time in every row is 45 minutes.

At 70–100% gray, the natural shade and the target shade are taken 2:1, and a mix tone goes into the formula so the target shade keeps its brightness.

Why does a light color leave gray hair see-through?

100% gray is covered with a natural shade tone on tone, 2 levels lighter or darker than the base. A natural shade 3–4 levels lighter than the base does not cover gray, it tones it. Such a lift needs a high developer percent: it thins the density of the color, and there is not enough pigment to cover gray hair. The hair lightens instead of filling with pigment, and gray stays see-through, with a shine.

If the target color is 3 or more levels lighter than the starting base, gray is first lightened with powder and then toned intensively with 3% developer at 1:1. Why toning follows powder is explained in the article on toner for bleached hair.

Frequently asked questions

Why does gray hair turn yellow?

Hair keratin itself is pale yellow, and the reflection of light makes gray look white. [2] This yellow is the own color of gray hair. It is canceled with violet: they are opposite colors on the color wheel.

Why is gray hair coarse?

Gray hair is considered coarser, stiffer and less manageable than pigmented hair; its medulla is widened, with a cavity in the center. [2] For coloring, the cuticle matters more: on resistant gray it is tight, porosity is low, and color gets in more slowly. [3]

How do you cover 100% gray?

With a natural shade tone on tone, 2 levels lighter or darker than the base. If a target shade is needed, the natural shade and the shade are taken 2:1, and on resistant gray at levels 2–7, pre-pigmentation is done before coloring or a dense mix with 9% developer is used. A color 3 or more levels lighter than the base comes only through lightening with powder and toning.

Sources

The numbers in the text match the links below. Links checked on October 16, 2026.

1. BCcampus: color assessment — § 2.3. The percent of gray and the natural shade in the formula.
2. IJDVL: premature graying of hair — Hair pigments, the optical white of gray hair, the cavity in the medulla, the coarseness of gray hair.
3. Open Exam Prep: gray hair in the formula — A tight cuticle, pre-softening before coloring, a sheer tone on gray.
4. Goldwell: gray coverage — Fashion shades and natural shades on gray, coarse hair.