Hultafors Blue Chalk is the most widely used chalk, suitable for both indoor and outdoor work. It contains dolomite and ultramarine for vibrant, long-lasting lines. The finely milled chalk adheres well to the cord, ensuring precise marking. This pigment-rich chalk provides intense marking strength and visibility, resulting in clear and permanent lines that cannot be painted over. Designed for outdoor use, it offers improved resistance to wind and rain and is suitable for all types of whipping cords. Hultafors offers quality tools for professionals and craftsmen, with Swedish premium quality since 1883.