How much leave-in mask should you use?
A handy dosage guide for every hair type, density, and length.
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How much leave-in mask should you use?
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Karl Schmieder
Karl is a biochemist + the CEO of MessagingLab, a company that works with other Scientists to help them tell their...
Heleen Kibbelaar
Heleen holds a bachelor's and master's degree in (physical) chemistry from the University of Amsterdam and Utrecht University in the Netherlands....
Aura Friedman
You name ‘em, Aura has colored their hair. From celebrities like Lady Gaga, magazines like Teen Vogue, and the...
Christine Thompson
As a professional colorist at Spoke & Weal in Los Angeles, Christine specializes in corrective color, color change, and working...
Esther Olu
Esther Olu is an R&D formulation scientist, esthetician, educator, science communicator who is a passionate advocate for dispelling misinformation within the...
