How to colour match hair extensions

Roots are usually deeper than the rest, and extensions sit below them. Matching to the root produces a set that reads too dark through the body of the hair, which is the most common error and the hardest to correct afterwards.

Hold the comparison against the mid-lengths — the section the extension will actually sit beside.

Depth is how light or dark hair is. Undertone is its temperature — warm, cool or neutral — and it is what makes two shades of identical depth refuse to blend.

Undertone is easier to see against a contrasting reference than in isolation. Place a warm shade and a cool shade of the same depth side by side against the hair; the mismatch announces itself immediately.

Indoor light distorts systematically: incandescent bulbs push warmth, and many salon lights push the other way. A match confirmed under either can fall apart outdoors.

Use daylight, indirect if possible, and check from more than one angle — hair reflects differently along its length.

Balayage, highlighted and shadow-rooted hair is not one colour, and matching it to a single flat shade is what makes extensions look applied. Dimensional hair usually needs the blend read at the root, the mid-length and the end separately.

The Dani Steel official catalogue offers 60 shades, each photographed from the physical catalogue and identified by its technical code — which is what makes a shade repeatable between one order and the next.

A photograph on a screen is a colour judgement made through two unknown displays. Colour match is confirmed by a specialist alongside suitability and maintenance planning.