Buy Bigen Hair Color Permanent - Bigen Permanent Powder Hair Color 45 Chocolate. How-to-Use: Before Application: *Complete the preliminary skin test 48 hours before each application. *Wear plastic or rubber gloves. *Cover shoulders with a towel or cape. *Be sure hair is clean and free of styling product buildup. To prevent staining, apply cold cream around your ears, hairline and the nape of your neck.Preparation: *Pour Bigen