This blue chalk powder is intended for chalk line. Available in different containers with 100, 250, 500 and 1,000 grams capacity. This product is water resistant, as it has a very good resistance regardless of the weather conditions. It is especially formulated for a good adhesion and high visibility in any working area. It is a very long-lasting powder on concrete, wood, brick, plaster and metal. It is mainly used for construction industry.