What is 4-Chlororesorcinol used for?

It is a coupler in permanent hair dyes, meaning it helps to develop and stabilize the final hair color. It is particularly important for achieving certain dark shades.

Is 4-Chlororesorcinol safe for use?

Like many hair dye ingredients, it can cause allergic reactions and skin irritation in some individuals. A patch test is strongly recommended before applying any product containing this ingredient.

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4-Chlororesorcinol

4-Chlororesorcinol is a chemical compound primarily used as a coupler in permanent hair dye formulations. It reacts with other dye precursors to create a wide range of hair colors, particularly in darker shades. This ingredient contributes to the final color result and its longevity.

NoneHair dye ingredientVeganEvidence: High

BenefitNone 0 / 4

RiskHigh 2.5 / 4

Sensitization i2.5 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Irritation i2.5 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Systemic exposure i1 / 4

Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.

Rated by SpottyLabs' ingredient methodology, independent of brands.

Things to watch

Can cause severe allergic reactions
May cause skin irritation or sensitization
Requires patch testing before use

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Products with 4-Chlororesorcinol

Crema Colorante per Capelli senza Ammoniaca

3.3/ 56/10/11

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Frequently asked questions

What is 4-Chlororesorcinol used for?: It is a coupler in permanent hair dyes, meaning it helps to develop and stabilize the final hair color. It is particularly important for achieving certain dark shades.
Is 4-Chlororesorcinol safe for use?: Like many hair dye ingredients, it can cause allergic reactions and skin irritation in some individuals. A patch test is strongly recommended before applying any product containing this ingredient.