How do you chalk your hair?
Rub the chalk into the hair and fluff. You can lightly spray the hairspray over the chalk to help it stick. If you use too much hair spray, it can make the hair sticky. This is slightly messy, but gives a great color and is easy to control.
I would get the hair wet then apply the chalk to both sides of the hair making sure to get all it the. Blow dry and style
Put some texturizing mousse, spray, dry shampoo, or something in the area you want to color, rub the chalk on it, then spray with hairspray!