Attitude Hair Dye – SYNTHWAVE Duo
SYNTHWAVE is a semi-permanent blue & black hair dye duo built for dark, electric looks — high-pigment Brave Blue paired with the deepest Daring Black. Vibrant on pre-lightened hair, a subtle tint on darker bases.
Vegan, cruelty-free and made in the Netherlands.
Description
Ride the retro-future. SYNTHWAVE pairs high-pigment Brave Blue against the deepest Daring Black — electric blue lighting up the black like neon against a night sky. Cool, high-impact and straight out of a retro-future. Wear them solo, split them across your head, or blend the two for a smoky blue-into-black fade. Set the night on neon.
This semi-permanent duo delivers cool, high-impact colour with zero damage. Like every shade in the range, it's nourishing, high-pigment and made without peroxide, PPD or ammonia — bold payoff, healthy hair.
Best results
For the most vibrant colour, apply SYNTHWAVE to pre-lightened hair. Both shades show brightest on a light base; on darker, unbleached hair they'll read as a softer, subtler tint.
Always do a patch and strand test before colouring to check how each shade turns out on your own hair.
Why you'll love it
- Blue & black semi-permanent duo — two full shades in one set
- Cool, high-impact, high-pigment colour
- Electric blue against the darkest black — neon-on-night contrast
- Lasts 4–10 weeks, depending on hair type and aftercare
- Brave fades cool, Daring fades to green
- One set covers short–medium hair (double up for long or thick hair)
- Best on pre-lightened hair; subtle tint on darker bases
- Formulated without peroxide, PPD or ammonia
- Vegan, cruelty-free and PCR recycled packaging
- Made in the Netherlands, together with the Attitude community
- DIY friendly with a professional-quality result
How to use
- Bleach — For the brightest result, pre-lighten your hair with Attitude Ghosted Bleach. SYNTHWAVE shows best on a very light base.
- Dye — Apply your chosen shade evenly to clean, dry or towel-dried hair, working it fully through from roots to ends. For a split look, section your hair and keep Brave and Daring on separate sides. Leave in for 30–60 minutes, or follow the pack instructions.
- Care — Rinse until the water runs mostly clear. Expect a little colour bleed during the first few washes — that's normal. Keep your colour fresh for longer with Attitude Holyplex Haircare.
Mix & match
Get creative with your duo. Wear Brave and Daring separately, section them for a blue-and-black split, or blend them for a smoky blue-into-black fade. Both shades fade gradually and can be refreshed or remixed — so the look grows with you.
Always test your mix on a strand first before applying it to your full head.
Good to know
SYNTHWAVE is a semi-permanent direct dye. The final result depends strongly on your starting hair colour, porosity, condition and previous treatments. On a light base you'll get the fullest payoff; on darker hair the colours turn softer and more muted.
Need help? Read our ultimate at-home hair dye guide and explore hair dye inspiration for ideas.
Community
Show us your colourful creations with #dyewithattitude and tag @dyewithattitude for a chance to be featured. Dye loudly.
For international orders up to €150, we cover the import costs. That means you won’t be charged unexpected import fees on delivery for orders within this amount.