DuraMark Chalk is premium construction chalk available in a multitude of chalk colors and permanence rated options to fit your marking needs. DuraMark has modified their construction chalk formula and sourced the best pigments to make sure the lines you strike stay where you put them, for as long as you want them to stay.
*Caution-this construction marking chalk can act as a permanent coloring agent on some materials. There is no known way to remove it. Use accordingly.