Paint over or wash off, applications include: drywall, trim work, framing, decking and cabinet installation. Yellow, green and orange chalks last longer and are ideal for low light applications, such as laying sub-floors in basements, they may also be used to show layout changes, applications include: roofing, masonry, tiling, plumbing and electrical work. Black is the most permanent color, followed by red - these weatherproof colors leave lines that remain visible after weeks of rain and wear and tear on the worksite, applications include: framing, roofing, steel & metal fabrication, cutting through concrete & stone and marking slabs. Highlights: 5 Lb. Interior or exterior use White and blue chalk are for temporary use They provide ample visibility and are easy to remove Bottle