This document provides information about selecting Copic marker colors that blend well together. It explains that Copic markers are labeled with a letter indicating their color family and numbers relating to saturation, tone, and darkness. Markers within the same color family that share the first number will blend most seamlessly. The document recommends choosing 2-3 markers with the same letter and first number for consistent blending while varying the second number for sufficient variation. It also notes that color families situated closer together on the Copic color wheel will blend better than those farther apart.