Holidays ❀⊱ℍalloween Tantalizing Attire⊰❀ Temp Hair Color ~Soak the chalk. Take an old pair of scissors and scraped off a fair amount of wet chalk. Add a little water to make a thick paste. Take a pinch of the paste and worked it into the hair. Let the wet chalk sit for awhile to help set the color. Finish drying on your lowest dryer setting and very carefully. The color comes out very light. Spray with a little hair spray. Should work for us too. Not sure how long it would take to wash out.