Ingredient review

Hydroxyethylaminoanisole Sulfate

INCI: 2-AMINO-4-HYDROXYETHYLAMINOANISOLE SULFATE

A synthetic dye used in hair color that can cause irritation in sensitive individuals but is generally considered safe in regulated concentrations.

beautyhair colorsynthetic dye

In plain English

This is a man-made color molecule used in hair dyes to create certain shades, especially browns and violets. It works by penetrating the hair shaft and reacting with other ingredients to form a permanent color. While effective, it can be irritating to the scalp or skin for some people, especially if used frequently or in high concentrations.

Quick decision guide

Read the cautions before using

Hydroxyethylaminoanisole Sulfate can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Hydroxyethylaminoanisole Sulfate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic aromatic amine compound used as a colorant in oxidative hair dyes. It is part of a class of ingredients that develop color when mixed with an oxidizing agent like hydrogen peroxide.

How it works

In a hair dye formulation, this ingredient is combined with an oxidizing agent (usually hydrogen peroxide) inside the hair shaft. The oxidation reaction creates larger color molecules that become trapped in the hair, resulting in a permanent or semi-permanent color change.

Pros

Effective color payoff

Provides rich, long-lasting color that resists fading better than many natural alternatives.

Versatile shade range

Can be combined with other dyes to create a broad spectrum of colors, from natural browns to vibrant violets.

Cons and cautions

Potential irritation

May cause redness, itching, or burning on the scalp or skin, especially with repeated use.

Allergic reactions possible

Some individuals may develop an allergic reaction, requiring a patch test before each application.

Best for

  • People looking for permanent or semi-permanent hair color
  • Those who want a wide shade range

Use caution if

  • Individuals with known sensitivity to hair dyes
  • Pregnant or nursing women (as a precaution)

Usage tips

Always perform a patch test 48 hours before using a new hair dye product.
Follow the manufacturer's instructions carefully, especially regarding mixing and application time.
Avoid using on broken or irritated scalp.

Safety summary

Generally considered safe for use in hair dyes at regulated concentrations. However, it can cause skin sensitization and irritation in some individuals. The Cosmetic Ingredient Review (CIR) panel has evaluated similar aromatic amines and found them safe with restrictions.

Research notes

Studies indicate that aromatic amine hair dyes can be skin sensitizers, but the risk is low with proper use and concentration limits. The EU Scientific Committee on Consumer Safety (SCCS) has reviewed related compounds and set safe usage levels.

Common label clues

Typical concentration
Typically 0.1% to 2% in hair dye formulations
Regulatory status
Approved for use in hair dyes in the EU and US within specified concentration limits. The EU CosIng database lists it as a hair dye ingredient with restrictions.
Common uses
Permanent and semi-permanent hair dyes
Environmental note
Synthetic hair dye ingredients can contribute to water pollution if not properly treated. Some regions have guidelines for disposal.

Good to know

  • This ingredient is commonly found in permanent hair dyes labeled as 'ammonia-free' or 'low-ammonia'.
  • It is often paired with other dye precursors to achieve the desired shade.

Common questions

What is Hydroxyethylaminoanisole Sulfate in beauty products?

This is a man-made color molecule used in hair dyes to create certain shades, especially browns and violets. It works by penetrating the hair shaft and reacting with other ingredients to form a permanent color. While effective, it can be irritating to the scalp or skin for some people, especially if used frequently or in high concentrations.

What does Hydroxyethylaminoanisole Sulfate do in a beauty product?

In a hair dye formulation, this ingredient is combined with an oxidizing agent (usually hydrogen peroxide) inside the hair shaft. The oxidation reaction creates larger color molecules that become trapped in the hair, resulting in a permanent or semi-permanent color change.

Is Hydroxyethylaminoanisole Sulfate safe for most people?

Generally considered safe for use in hair dyes at regulated concentrations. However, it can cause skin sensitization and irritation in some individuals. The Cosmetic Ingredient Review (CIR) panel has evaluated similar aromatic amines and found them safe with restrictions.

Who should be careful with Hydroxyethylaminoanisole Sulfate?

Individuals with known sensitivity to hair dyes Pregnant or nursing women (as a precaution)

Research sources

EU CosIng DatabaseOpenCosmetic Ingredient Review (CIR) - Aromatic AminesOpenPubMed - Hair Dye Safety ReviewOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.