Ingredient review

Acid Orange 7

INCI: CI 15510

A widely used synthetic orange dye that is generally safe in low concentrations but may cause allergic reactions in sensitive individuals.

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In plain English

Acid Orange 7 is a man-made color additive that gives products an orange hue. It's commonly found in soaps, shampoos, and makeup. While it's approved for use in many countries, some people may experience skin irritation or allergic reactions, especially if they have sensitive skin or allergies to other dyes.

Quick decision guide

Read the cautions before using

Acid Orange 7 is generally a lower-concern ingredient when the full formula suits your skin.

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 Acid Orange 7.
  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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

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

Acid Orange 7 is a synthetic azo dye, chemically known as sodium 4-[(2-hydroxy-1-naphthyl)azo]benzenesulfonate. It is produced through a chemical reaction and is not derived from natural sources.

How it works

In cosmetic products, Acid Orange 7 works by absorbing and reflecting specific wavelengths of light to produce an orange color. It is water-soluble and can be easily incorporated into a variety of formulations to achieve the desired shade.

Pros

Vibrant color

Provides a bright, consistent orange shade that is stable across many product types.

Cost-effective

Synthetic dyes like Acid Orange 7 are inexpensive to produce, keeping product costs low.

Cons and cautions

Allergic potential

Can cause contact dermatitis or allergic reactions in people sensitive to azo dyes, especially in leave-on products.

Environmental concerns

As an azo dye, its production and disposal may contribute to water pollution if not properly managed.

Best for

  • People without known dye allergies
  • Those looking for vibrant, stable color in their products

Use caution if

  • Individuals with sensitive skin or known allergies to azo dyes
  • People who prefer natural or plant-based colorants

Usage tips

Patch test any new product containing this dye on a small area of skin before full use.
If you have a history of reactions to hair dyes or other colored cosmetics, check labels for Acid Orange 7 and consider dye-free alternatives.

Safety summary

Generally recognized as safe for use in cosmetics at low concentrations, but may cause skin irritation or allergic reactions in sensitive individuals. Regulatory bodies have set usage limits to minimize risk.

Research notes

Studies confirm that Acid Orange 7 is a common contact allergen in some populations, particularly in leave-on products. However, at typical use levels, the risk is low for most consumers.

Common label clues

Typical concentration
Typically used at very low concentrations, often below 1%
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU (EC) with concentration limits in some product types. Always check local regulations.
Common uses
Soaps, Shampoos, Bath products, Lip products, Nail polishes
Environmental note
Azo dyes can persist in the environment and may break down into potentially harmful compounds. Proper waste treatment is important.

Good to know

  • Acid Orange 7 is also known as D&C Orange No. 4 in the US and is approved for use in cosmetics by the FDA.
  • In the EU, it is listed as CI 15510 and is permitted in rinse-off products at certain concentrations.

Common questions

What is Acid Orange 7 in beauty products?

Acid Orange 7 is a man-made color additive that gives products an orange hue. It's commonly found in soaps, shampoos, and makeup. While it's approved for use in many countries, some people may experience skin irritation or allergic reactions, especially if they have sensitive skin or allergies to other dyes.

What does Acid Orange 7 do in a beauty product?

In cosmetic products, Acid Orange 7 works by absorbing and reflecting specific wavelengths of light to produce an orange color. It is water-soluble and can be easily incorporated into a variety of formulations to achieve the desired shade.

Is Acid Orange 7 safe for most people?

Generally recognized as safe for use in cosmetics at low concentrations, but may cause skin irritation or allergic reactions in sensitive individuals. Regulatory bodies have set usage limits to minimize risk.

Who should be careful with Acid Orange 7?

Individuals with sensitive skin or known allergies to azo dyes People who prefer natural or plant-based colorants

Research sources

FDA Color Additive Status ListOpenEuropean Commission CosIng DatabaseOpenPubMed - Contact allergy to azo 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.