Formula

Instagram via @nikkilee901

Formula A (full highlight)
Joico Blonde Life Powder Lightener with 20-volume LumiShine developer
Formula B (pre-toner)
Joico Blonde Life Quick Tone Liqui-Crème Toner Silver + Clear + 5-volume LumiShine developer
Formula C (light blue)
Joico Color Intensity 1 part True Blue + 1 part Mermaid Blue + 2 parts Clear
Formula D (mint)
Color Intensity 4 parts Clear + 1 part Mermaid Blue

Hilary Duff's Cool Blue Formulas

The perfect blue shade doesn't exist—wait, it totally does thanks to Nine Zero One Salon co-owner and celeb stylist Nikki Lee (@nikkilee901)! Nikki gave our dream girl Hilary Duff a full-foil highlight and mixed up some cool shades for the perfect blue blend. Keep scrollin' for the color formulas, how-to and a pro tip to prevent unwanted green tones! Nikki's Celeb Color Notes: "Hilary is no stranger to a fun hair color," said Nikki. "She colored her own hair teal during lockdown. This mix of blues just hits different on her though! She is goals in many...