Color Evaluator Glasses that help you select contrasting colors for your projects. Close or cover one eye to view your project through the glasses to determine color value: light, medium, or dark. Turns what you see into gray scale (black and white).View through the RED LENS for all colors except reds. Use the GREEN LENS for all colors except greens. Includes protective drawstring storage bag.Great for quilting, oil & watercolor painting, graphic design, mixed media art, sewing, rug hooking, plein air painting and more.