Hair chalk is a temporary hair coloring product that allows users to add vibrant colors to their hair without the commitment of permanent dye. It comes in various colors and is easy to apply, making it popular for special occasions, festivals, or simply for fun. The chalk typically washes out with shampoo, making it a great option for those who want to experiment with their look. To use hair chalk, you simply rub the chalk onto sections of dry hair, and the color adheres to the strands. It works best on light or pre-lightened hair, but can also show up on darker shades. After application, a light spray of hairspray can help set the color for longer wear.