Please note colors on these charts are based on gray concrete. Samples on these charts represent the color of finish in a controlled environment using materials that may vary in different locations. Many factors affect the color of the materials used, curing/sealing and the weather. These charts must be used only as a guideline for color selection. Computer screen resolution and printers vary greatly and can affect how the colors appear. Actual charts may be picked up or mailed, however, color variations may occur due to the differences in cement, aggregates and preparation/application.