Basic Blue 3

What is Basic Blue 3?

Basic Blue 3, also known as CI 51004, is a synthetic cationic dye from the triarylmethane family, characterized by its brilliant blue hue. Developed as a basic dye, it carries a positive charge that enables strong binding to the negatively charged keratin in hair. Primarily found in hair coloring products like semi-permanent or temporary dyes, it functions as a direct colorant by physically adsorbing onto the hair shaft without requiring chemical oxidation. This allows for visible shade changes, gray coverage, and color enhancement through simple deposition and rinse-off or leave-in application. Its water-soluble nature supports even distribution in formulations, contributing to fade-resistant results under proper use.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 4 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Hair colorant
Delivers hair color through dyes and/or pigments (direct or oxidative systems), producing a visible shade change and supporting coverage and longevity.
Hair dyeing
Supports chemical color change of hair (e.g., oxidative dye development or bleaching), enabling shade transformation through controlled reactions on the fiber.

Benefits

Delivers vivid blue tones for creative hair styling.

Supports effective gray hair coverage in dye systems.

Enables customizable color longevity in non-permanent applications.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People experimenting with bold blue hair shades.
Those with known allergies to hair dyes.
Users preferring semi-permanent color options.
People experiencing scalp sensitivity.
Individuals seeking dye-based coverage without bleaching.
Individuals with a history of contact dermatitis from colorants.

Safety Notes

  • Potential for allergic sensitization; perform a patch test before full use.
  • Follow product instructions to minimize exposure risks.

Frequently Asked Questions about Basic Blue 3

What is Basic Blue 3 used for?

It serves as a hair colorant in dyes, providing blue shades through direct deposition on hair.

Is Basic Blue 3 suitable for sensitive skin?

It may sensitize some users; patch testing is advised for those with sensitivities.

Does Basic Blue 3 clog pores?

It has a comedogenic rating of 0, indicating low likelihood of pore blockage.