The Eco-Stain Colors can be used for interior or exterior concrete or concrete overlay systems. Each color on this chart is representative of the stain color being placed on a medium gray concrete background. We always recommend sampling any color on your concrete to determine the final choice of color to be applied. Your concrete background will ultimately determine the final color outcome of the stain color. Final Color selection is based upon sampling and approval by the owner or owner’s representative usually at the time of service.