Ingredient review

Basic Orange 31

INCI: Basic Orange 31

Basic Orange 31 is a synthetic hair dye colorant that can provide vibrant orange tones but may cause skin irritation in sensitive individuals.

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In plain English

Basic Orange 31 is a man-made dye that adds orange color to products like hair dye. It's part of a group of 'basic' dyes that stick well to hair fibers. While it can create bright, lasting color, it may irritate the skin or scalp, especially for people with sensitive skin. It's not used in leave-on skincare but mainly in rinse-off hair products.

Quick decision guide

Read the cautions before using

Basic Orange 31 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 Basic Orange 31.
  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

Basic Orange 31 is a synthetic cationic dye belonging to the azo dye family, commonly used in semi-permanent and temporary hair color formulations.

How it works

In hair dye, Basic Orange 31 carries a positive charge that binds to the negatively charged hair shaft, allowing the color to deposit evenly and resist washing out for several shampoos.

Pros

Vibrant color payoff

Creates bright, true orange tones that are popular in fashion hair colors.

Good wash resistance

Lasts through multiple washes, providing longer-lasting color compared to some natural dyes.

Cons and cautions

Irritation risk

Can cause contact dermatitis or scalp irritation, especially in people with sensitive skin or eczema.

Staining potential

May stain skin, towels, and clothing during application, requiring careful use.

Best for

  • People looking for temporary or semi-permanent orange hair color
  • Those without known sensitivity to hair dyes

Use caution if

  • Individuals with sensitive scalp or known allergy to hair dyes
  • Pregnant or breastfeeding women (as a precaution)

Usage tips

Always perform a patch test 48 hours before using any product containing Basic Orange 31.
Wear gloves during application to avoid staining hands.

Safety summary

Basic Orange 31 is considered safe for use in rinse-off hair products at regulated concentrations, but it can cause skin irritation or allergic reactions in sensitive individuals. Patch testing is strongly advised.

Research notes

Studies indicate that Basic Orange 31 has low acute toxicity but may act as a skin sensitizer in some people. Regulatory bodies have set safe usage limits based on available data.

Common label clues

Typical concentration
Typically used at very low concentrations (under 1%) to achieve desired color.
Regulatory status
Approved for use in rinse-off hair products in the EU and US, but subject to concentration limits. Not permitted in leave-on cosmetics in some jurisdictions.
Common uses
Hair dyes, Temporary hair color, Color cosmetics
Environmental note
Synthetic dyes can persist in wastewater; proper disposal of hair dye products is recommended to minimize environmental impact.

Good to know

  • Basic Orange 31 is often used in combination with other basic dyes to achieve custom shades.
  • It is not approved for use in leave-on products in some regions due to irritation concerns.

Common questions

What is Basic Orange 31 in beauty products?

Basic Orange 31 is a man-made dye that adds orange color to products like hair dye. It's part of a group of 'basic' dyes that stick well to hair fibers. While it can create bright, lasting color, it may irritate the skin or scalp, especially for people with sensitive skin. It's not used in leave-on skincare but mainly in rinse-off hair products.

What does Basic Orange 31 do in a beauty product?

In hair dye, Basic Orange 31 carries a positive charge that binds to the negatively charged hair shaft, allowing the color to deposit evenly and resist washing out for several shampoos.

Is Basic Orange 31 safe for most people?

Basic Orange 31 is considered safe for use in rinse-off hair products at regulated concentrations, but it can cause skin irritation or allergic reactions in sensitive individuals. Patch testing is strongly advised.

Who should be careful with Basic Orange 31?

Individuals with sensitive scalp or known allergy to hair dyes Pregnant or breastfeeding women (as a precaution)

Research sources

European Chemicals Agency (ECHA) - Basic Orange 31OpenCosmetic Ingredient Review (CIR) - Basic Dyes SafetyOpenPubMed - Contact dermatitis from hair dyesOpen

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.