Hair chalk in round box in the colour green. Give your hair a fun fix by colouring locks or hair tips with hair chalk! Open the box, put a lock of hair between it and close the box. Then slide the box from top to bottom over the lock of hair and create colour. If you want the colour to attach to the hair better, try to apply it to wet hair and spray hairspray over it when the hair is dry. The hair chalk fades from the hair after one or a few washings (depending on the hair colour and colour of the chalk). The hair chalk is available in several colours.