A coloring sheet, coloring book, coloring roll, and coloring desk and roll assembly having a coloring sheet with a printed coloring image outline on one surface is substantially visually imperceptible under normal viewing conditions, such as when viewed at a non-coloring distance using a standard incandescent light source, and a method of coloring the sheet. The image may be printed with ink extender, ultraviolet, or infrared ink, or printed opposite the coloring surface.