Loreal pro- hair chalk

Loreal professional hair chalk. Its a temporary color varnish for the hair. From experience and reviews its the best hair chalk i have ever used on clients. I must say tho the color does last longer then one wash depending on the color. The colors that i have at the moment are blue ocean cruise, bronze beach, black tie, and first date violet. These go for 20$ each im selling for 10$ each. ?