20 Dreamy Blue Peekaboo Hair Color Looks
Twenty blue peekaboo looks, and an honest warning — blue is the hardest vivid there is. It turns green over any leftover warmth, and then it fades green too. Both problems have the same cause.
In this article · 26
- What Blue Actually Needs
- The 20 Blue Looks
- 1. Sapphire Under Black
- 2. Deep Teal Under Dark Brown
- 3. Electric Blue Under Black
- 4. Sky Blue Under Blonde
- 5. Navy Under Dark Brown
- 6. Turquoise Under Platinum
- 7. Blue-Violet Blend
- 8. Denim Blue
- 9. Peacock Blend
- 10. Blue Under a Bob
- 11. Nape-Only Blue
- 12. Blue Ends Only
- 13. Blue in a Dutch Braid
- 14. Ice Blue Under Silver
- 15. Blue on Curly Hair
- 16. Blue Extensions in Braids
- 17. Blue to Purple Ombré
- 18. Steel Blue Under Brunette
- 19. Blue Undercut
- 20. Cobalt Under Black
- Fighting the Green Fade
- Mistakes to Avoid
- FAQ
- Final Thoughts
Blue is the shade people want most and the one that goes wrong most, and both facts have the same explanation.
Blue over yellow makes green. When dark hair is lifted, yellow is what remains, so unless the panel is lifted far enough and then toned, blue lands green.
Then, as it fades, the blue pigment leaves before the rest — exposing the green underneath again. Blue arrives green if you under-lift, and departs green regardless.
What Blue Actually Needs
A pale yellow base at minimum. Four or more levels of lift on dark hair, which usually means more than one session.
Toning before the colour. This is the step most often skipped and the one that decides the result. A blue-violet or purple-based toner neutralises the remaining yellow so the blue has a neutral base to sit on.
Ask specifically whether toning is included. "Lift and colour" quotes sometimes do not include it, and a lifted-but-untoned panel is exactly the yellow base that makes blue green.
Then accept the fade. Blue is the fastest-fading vivid, and it fades toward green. Plan to refresh every three to four weeks, or choose a shade that fades better.
If that sounds like a lot of conditions, it is — which is why deep teal and sapphire, which carry more pigment and tolerate a less perfect base, are the sensible starting points.
The 20 Blue Looks
1. Sapphire Under Black
Deep enough to work on a less-than-perfect base.
2. Deep Teal Under Dark Brown
Between blue and green, so a little green does not matter.
3. Electric Blue Under Black
The classic. Needs a full lift and toning.
4. Sky Blue Under Blonde
No lifting on a light base, and the easiest blue there is.
5. Navy Under Dark Brown
The deepest blue, and the most forgiving on dark hair.
6. Turquoise Under Platinum
Needs a very pale base to stay turquoise rather than green.
7. Blue-Violet Blend
Purple in the mix protects against the green shift.
8. Denim Blue
Muted and grey-toned. Fades softly rather than green.
9. Peacock Blend
Blue, teal and green together, so fading is invisible.
10. Blue Under a Bob
Two-tone at this length. Commit to it being visible.
11. Nape-Only Blue
Small panel, less lifting, fully hideable.
12. Blue Ends Only
Colour on the lower half. Cheaper, and less to maintain.
13. Blue in a Dutch Braid
Woven pattern, and braiding hides uneven fading.
14. Ice Blue Under Silver
Cool on cool, and it requires a full lift and toning.
15. Blue on Curly Hair
Curl separation shows the panel constantly.
16. Blue Extensions in Braids
No lifting at all, any blue you want.
17. Blue to Purple Ombré
Fades toward purple rather than green.
18. Steel Blue Under Brunette
Muted enough to survive residual warmth.
19. Blue Undercut
Hidden until lifted, and easy to refresh.
20. Cobalt Under Black
Rich and saturated, and it holds longer than lighter blues.
Fighting the Green Fade
Choose a blue with purple in it. Blue-violet and cobalt fade toward purple rather than green, which is the single most effective decision here.
Use a blue-depositing conditioner on wash days. It replaces the blue pigment that leaves first, which is exactly what causes the green.
Cool water, sulphate-free shampoo, and wash the panel less than the rest of your hair.
Avoid chlorine entirely. Pool water plus blue pigment plus porous hair is a reliable green, and it happens in one swim.
Refresh before it fades, not after. Topping up a blue that is still blue is easy; correcting one that has gone green means toning or re-lifting.
Mistakes to Avoid
Skipping the toner. The single most common cause of green blue.
Blue on an under-lifted dark panel. Green, reliably.
Assuming a fade will be even. Blue leaves first and unevenly.
Swimming without protection. One session in a pool can do it.
Choosing bright turquoise as a first blue on dark hair. It needs the palest base of any shade here.
FAQ
Why did it turn green? Yellow left in the hair. Blue over yellow makes green.
Does blue fade green? Usually — the blue pigment leaves first, exposing green.
What base does it need? Pale yellow at minimum, toned to neutral before colouring.
Final Thoughts
Ask whether toning is included before you book, and choose a blue with purple in it. Blue is the most demanding shade in this silo — but the two problems it has are the same problem, and both are solved by the base being properly neutral before any blue goes near it.
For the easiest vivid see 20 stunning purple peekaboo hair color looks, and for red see 15 fiery red peekaboo hair color ideas. More in Hair Color Trends.
