Underlayer colour, sometimes called peekaboo or hidden colour, is applied only to the lower sections of hair so the top canopy stays natural. Let the hair down or tie it up and the shade flashes through; leave it smooth and it barely shows. This gallery includes candy apple red under brown, icy white blonde beneath black, a silver halo framing dark hair, emerald green under brunette and a purple-and-blue melt under platinum.
It’s an appealing choice for anyone with a dress code, a first-timer testing vivid shades, or someone who hates visible regrowth, because the coloured section starts underneath where roots are hidden. Short cuts work too: there’s a canary yellow block on a cropped style, purple under a buzzed undercut and green tucked beneath short layers.
Darker hair usually needs lightening in the underlayer before a bright shade will show, so plan for a bleach step. The hidden section also gets less sun, which can slow fading slightly, but direct dyes still need gentle washing.
1. Candy Apple Red
Natural brown hair hides a thick band of glossy, candy apple red underneath. Lifting the top layer or tying the hair back reveals a dramatic burst of colour, making it a complete style change without dyeing the whole head.
Inspiration: @stephjannerie.beauty
2. The Best of Both Worlds
Glowing icy blonde tucked beneath black hair gives a striking contrast while staying surprisingly low maintenance. Because the light section sits underneath, regrowth at the scalp is concealed, so touch-ups can be spaced out. Toning the blonde section regularly keeps it icy rather than brassy.
Inspiration: @pimpmydoo
3. Mermaid Peekaboo
Under a platinum top layer, purple and blue shades melt together like a mermaid’s tail. Using more than one vivid hue in the hidden section creates a gradient that looks great whatever the colour above it.
Inspiration: @the_colorchameleon
4. Purple Rockstar
Purple is an easy first step into vivid colour, and it sits well alongside almost any natural shade. Placed underneath, it shows beautifully when the hair is braided, weaving violet stripes through each plait. A colour-depositing conditioner can top up the violet between salon visits.
Inspiration: @sessionswithsteph
5. Subtle Statement
Only a small section of an edgy short haircut is coloured canary yellow, yet it makes the whole style feel sharper. Bright, graphic colour suits a bold cut, and keeping it to one panel stops it from overwhelming the look.
Inspiration: @ruben_pe_pa
6. Ice Queen
Pale blue placed through light, icy blonde gives a frosty, wintry effect. Cool tones on cool tones always harmonise, and the soft blue adds just enough colour to make platinum feel fresh. A purple shampoo keeps the platinum crisp around the blue.
Inspiration: @john.n1115
7. Curly Pop
Natural curls get extra drama from blue strands placed in a halo beneath the top layer. As the curls move and bounce, the colour flashes through, emphasising texture rather than hiding it. Curl cream applied to damp hair keeps the coils defined around the colour.
Inspiration: @lyndadidit
8. Rainbow Road
Bands of rainbow colour are placed in the middle layers of blonde hair, so pops of brightness shine through the natural base. With movement the effect can look almost iridescent, like light through a prism.
Inspiration: @vanity_byrose
9. Emerald Green
Deep emerald green under dark brown hair is a rich, jewel-like pairing. The colour peeks through when hair shifts, giving a bold but sophisticated accent that still looks polished in professional settings. Wash with cool water to slow the green from fading.
Inspiration: @funhaircolour
10. Silver & Black
Silver and black combine in a halo placement, with the light colour applied all around the hairline beneath the top layer. That way it shows both from underneath and around the edges, making the contrast especially crisp.
Inspiration: @behindtherosychair
11. Fire & Ice
Dark red on top and bleached white-blonde underneath play off each other like fire and ice. The opposing tones create high contrast and make the red appear even richer when the hair moves. Rinse carefully so red pigment doesn’t bleed into the blonde section.
Inspiration: @vanity_byrose
12. Jewel Tones
Rather than a single hidden colour, several jewel-toned layers sit beneath blonde strands. Each time the hair is styled differently a new combination appears, so the look never feels quite the same twice. Ask your colourist to separate each band with foils for crisp layers.
Inspiration: @danalynnhair
13. Slime Time
Neon green beneath jet-black hair is an electric contrast that’s hard to miss. The black frames the bright shade perfectly; expect neon pigments to fade fairly quickly and plan regular refreshes. Pre-lightening the hidden section is essential for neon to show on black hair.
Inspiration: @marissaxbeauty
14. Undercut
Vibrant purple is fully exposed on a short buzzed undercut beneath a piecey pixie. This is the boldest version of the trend, with the coloured section always visible and the textured top adding contrast. Clipper touch-ups every few weeks keep the undercut and its colour crisp.
Inspiration: @noemivalenciahair
15. Yellow Line
Instead of hiding colour underneath, a bold line of yellow runs along the ends, an unusual placement that feels creative and graphic. The tones complement each other and draw the eye to the cut’s perimeter.
Inspiration: @baldmonkey_hairmakers
16. Money Piece
Two tones of pastel pink frame the face as a money piece, adding a peekaboo layered effect. It’s ideal for anyone who wants to try colour without full commitment, since only the front sections are lightened and toned.
Inspiration: @vanity_byrose
17. Short Layers
On short layered hair, green placed under the top layers stays visible however the hair is styled. It’s a fun way for short cuts to get a colour pop without needing long lengths to show it off.
Inspiration: @krista42
18. Pastel
Soft pastel shades sit underneath blonde hair, creating a gentle, pretty contrast. Because pastels need a pale base, they blend easily into blonde and fade gracefully, making them a low-pressure way to try colour. Expect to refresh pastel tones roughly every month to keep them visible.
Inspiration: @neonheart.hair
19. Watermelon
Pink and green, the colours of a watermelon, are placed through a heavily layered textured cut. The choppy shape helps each colour show in separate pieces, giving a playful, summery effect. Style with a texture spray so the coloured pieces stay separated.
Inspiration: @tina_does_hair
Choosing where the hidden section sits
Placement changes how often people see the colour. Talk to your colourist about how you usually wear your hair before they section it.
- Nape-only panel: shows mainly in ponytails and buns; the most discreet option.
- Halo or ring placement: colour circles the head beneath the top layer, so it peeks out around the hairline as well as underneath.
- Behind the ears: visible when hair is tucked, ideal for bobs and lobs.
- Under short layers or an undercut: always on show, giving the boldest effect.
Protecting the line between natural and colour
Ask for the coloured section to be cleanly separated with foil or film so bright pigment doesn’t bleed onto the top layer during processing. At home, rinse with cool water until it runs clear after the first few washes, since vivid reds, greens and purples can stain lighter hair. A colour-safe shampoo and occasional colour-depositing mask in the underlayer shade will keep it saturated between appointments, and refreshing every six to eight weeks is usually enough.