Black, Brown, White and Slate are the 4 primary colors found in stone. With the 4 colors to work with in this pack, you should be able to easily match one of the primary colors that is in your stone. (Black or Slate mixed with white also makes light grey) Our EZ-Tint powders are so concentrated that you often literally need only a pin-head size for small mixes. Add in just a particle or two to see how far it goes, then add in more to reach your desired consistency to achieve a perfect color match. Use the free 2"x4" shaping-strip to form the epoxy to your stone's profile. Strip can also be used n flat surfaces to force the epoxy into cracks and flatten it level with stone's surface. Tape tightly into place until dry.