At-home tips from a model, an artist and a professional colorist. By Kari Molvar Beauty School answers common beauty questions with help from creative people who’ve become experts on the job. Sign up ...

Demi-permanent hair color is ammonia-free, slightly alters hair tone, and lasts between five to 12 washes. Unlike ...

Experts sound off.

Zhaoming says to monitor how often you dye your hair carefully. “My advice is not to dye your hair more than once every three months, or no more than four times a year,” she says. “Reducing the ...