Handy chart consists of 115 color chips for identifying the range of rock colors. Chart form and arrangement based on widely accepted Munsell® system. Color names based on ISCC-NBS Standards (Inter Society Color Council – National Bureau of Standards). Munsell numerical designation under each color name. Works with either wet or dry specimens. Excellent for describing color of medium to fine-grained rocks. Also helpful when working with coarse-grained rocks. Mask and instructions included.