£15. complete set of 24 different colored hair chalks. Easy to apply to hair and easy to wash out! How to Use Hair Color Chalk: 1. Dampen the hair where you would like the colors. 2. Rub hair color chalks on the damp section of hair. 3. For longer lasting colors, straighten or curl the hair using heat. 4. For chalking dry hair, wet the pastel chalks first and then rub on your hair.