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Ingredient dictionary

Resorcinol

Also listed as: 1,3-Benzenediol, Resorcin

Resorcinol is a small phenol compound used to help form hair color and to gently loosen dead skin in some products. It is on the label of 1 product in our library. Checked against our library November 6, 2026.

The catch: it can irritate skin and scalp, especially at higher strengths, and some people are sensitive to it, so a patch test first is a sensible step.

What Resorcinol does

  • Helps form color in oxidative hair dyes
  • Gently loosens dead skin cells
  • Supports a smoother skin surface

Chemists make resorcinol through industrial synthesis, so it is not taken from plants. It belongs to the phenol family, a group of compounds built on a benzene ring with hydroxyl groups attached.

In hair color, resorcinol acts as a coupler. It reacts with other dye ingredients during mixing to build color molecules that stay in the strand. In skin care, it is used as a keratolytic, which means it helps loosen the bonds between dead skin cells so they shed more easily. On sensitive skin it can feel mildly stinging, so start slowly.

Good for

Suits people who use hair color or skin products that aim to smooth rough or flaky skin, and who tolerate it well.

Frequently asked questions

What is resorcinol used for in hair dye?

Resorcinol is a coupler in oxidative hair dye. A coupler mixes with a developer and an intermediate to form the color molecules that stay in the hair. It helps set the shade and depth of the color.

Is resorcinol safe for sensitive skin?

Resorcinol can irritate sensitive skin, especially at higher strengths. Many people tolerate low levels well, but those with reactive skin should do a patch test on the inner arm first, wait a day or two, and stop use if redness, itching, or stinging appears.

Products with Resorcinol

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Amazon UK prices as of 6 November 2026, 04:30 GMT; Amazon sets the final price at checkout.