💇 The Chemistry of Hair Dye | How Does Permanent Hair Color Work?

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the Chemistry of Hair Dye | How Does Permanent Hair Color Work?

Ever wondered how a hair dye can change your natural hair colour for months without simply washing away? The secret is a fascinating combination of organic chemistry, oxidation and polymer formation!

Permanent hair dye uses ammonia and hydrogen peroxide to modify the hair structure and create long-lasting colour.

Key Chemistry Concepts:

Hair Cuticle: The protective outer layer made of overlapping scales.

Ammonia (NH₃): Creates an alkaline environment and causes the hair shaft to swell, helping the cuticle lift.

Hydrogen Peroxide (H₂O₂): Oxidizes natural melanin pigments and helps develop artificial dye colour.

Dye Intermediates: Small colourless or lightly coloured molecules that penetrate the hair shaft.

Oxidation and Polymer Formation: Dye intermediates react to form larger coloured molecules trapped inside the hair.

Why Is Permanent Hair Dye Long-Lasting?

The developed colour molecules are too large to wash out easily, giving the hair a longer-lasting colour.

Chemistry in Everyday Life:

- Ammonia contributes to the characteristic smell of many permanent dyes.

- Chemical processing can damage the cuticle and affect hair proteins and moisture.

- Conditioning helps improve hair smoothness and manageability after colouring.

Explore the science behind beauty products with Chemistry Preparation!