Using these hair coloring foils is a breeze. First, grab a sheet from the pop - up dispenser box. Then, fold it according to your hair coloring needs as they're easy to fold. Apply the hair color on the section of hair and place it on the foil. Since they have a non - slip texture, the hair will stay in place during the coloring process. As for maintenance, keep the box in a dry place. Don't expose the foils to excessive moisture as it might affect their texture. And when you're done, simply close the box properly to keep the remaining foils clean and ready for next use.