Whether bright red, jet black or a shade in between, natural hair color is determined by how much melanin is in your hair. This pigment, which is also found in skin and eyes, has two types: “Eumelanin ...

“As someone in their 50s, I must color my hair every three weeks to avoid the sparkle of gray hair,” says pro hairstylist and salon owner Wendy Burns. “I sympathize with my clients who just can’t do ...