Ingredient review
2-Chloro-6-Ethylamino-4-Nitrophenol
INCI: 2-CHLORO-6-ETHYLAMINO-4-NITROPHENOL
A synthetic hair dye ingredient that provides yellow tones in permanent color, but may cause skin irritation in sensitive individuals.
In plain English
This is a man-made color molecule used in permanent hair dyes to create yellow shades. It works by reacting with other ingredients inside the hair shaft during the coloring process. While it is generally considered safe for use in hair products, it can sometimes cause mild skin irritation, especially for people with sensitive scalps or known allergies to hair dye.
Quick decision guide
Read the cautions before using
2-Chloro-6-Ethylamino-4-Nitrophenol 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging 2-Chloro-6-Ethylamino-4-Nitrophenol.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
moderateCan bother some users, especially with frequent use, damaged skin, or strong companion ingredients.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic nitrophenol compound used as a dye intermediate in oxidative hair color formulations. It is part of the HC (Hair Color) dye family and is listed as HC Yellow No. 10 in some regulatory contexts.
How it works
In oxidative hair dye, this ingredient is mixed with a developer (usually hydrogen peroxide) just before application. It penetrates the hair cuticle and reacts with other dye precursors to form larger color molecules that become trapped inside the hair shaft, producing a yellow tone that is resistant to washing.
Pros
Effective yellow colorant
Produces stable, vibrant yellow tones that last through multiple washes in permanent hair color formulas.
Precise shade control
Can be blended with other dye intermediates to create a wide range of custom shades from golden blonde to bright yellow.
Cons and cautions
Skin irritation risk
May cause mild to moderate skin irritation or allergic reactions, especially on sensitive scalps or with repeated use.
Limited safety data
Compared to some other hair dye ingredients, there is less publicly available research on long-term effects of this specific compound.
Best for
- People looking for permanent yellow hair color
- Those who have used similar hair dyes without reaction
Use caution if
- Individuals with known allergies to hair dye ingredients (especially PPD or related compounds)
- People with sensitive or irritated scalps
Usage tips
Safety summary
Generally considered safe for use in rinse-off hair dyes at concentrations up to 1.5%. However, it can cause skin irritation or allergic reactions in some individuals. A patch test is strongly recommended before use.
Research notes
Limited peer-reviewed studies specifically on this compound, but it is part of a class of nitrophenol dyes that have been evaluated by cosmetic safety panels (e.g., CIR) and found safe for use in hair dyes under current restrictions.
Common label clues
- Typical concentration
- Up to 1.5% in rinse-off hair color products
- Regulatory status
- Approved for use in cosmetic hair dyes in the EU and US within specified concentration limits. Always check local regulations as they may vary.
- Common uses
- Oxidative hair dyes, Permanent hair color
- Environmental note
- As a synthetic compound, it may persist in wastewater. Proper disposal of hair dye products is recommended to minimize environmental impact.
Good to know
- This ingredient is not used in leave-on products; it is only found in rinse-off hair color formulations.
- It is often listed as HC Yellow No. 10 on ingredient labels in some regions.
Common questions
What is 2-Chloro-6-Ethylamino-4-Nitrophenol in beauty products?
This is a man-made color molecule used in permanent hair dyes to create yellow shades. It works by reacting with other ingredients inside the hair shaft during the coloring process. While it is generally considered safe for use in hair products, it can sometimes cause mild skin irritation, especially for people with sensitive scalps or known allergies to hair dye.
What does 2-Chloro-6-Ethylamino-4-Nitrophenol do in a beauty product?
In oxidative hair dye, this ingredient is mixed with a developer (usually hydrogen peroxide) just before application. It penetrates the hair cuticle and reacts with other dye precursors to form larger color molecules that become trapped inside the hair shaft, producing a yellow tone that is resistant to washing.
Is 2-Chloro-6-Ethylamino-4-Nitrophenol safe for most people?
Generally considered safe for use in rinse-off hair dyes at concentrations up to 1.5%. However, it can cause skin irritation or allergic reactions in some individuals. A patch test is strongly recommended before use.
Who should be careful with 2-Chloro-6-Ethylamino-4-Nitrophenol?
Individuals with known allergies to hair dye ingredients (especially PPD or related compounds) People with sensitive or irritated scalps
Research sources
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.