... be easily colored with any hair chalk colors, for example, green, pink, blue, red, lime, light pink, light blue, ... will not work very well on dark hairs. For example, green, yellow, lime …, but pink, blue, purple are ... while dying hair. The hair chalk is non-toxic and is not harmful but it is messy. 3. Twist Hair to more ... . HAIR CHALK 12 BRIGHT COLOR HAIR CHALKING IS FUN SAFE AND EASY(CHALK HAIR DRY)