Abstract: A system for visual communication, the system being particularly useful in designing and producing games, puzzles, autocorrective tests, programed teaching materials, coloring sets or sheets, graphic arts supplies and various other educational, game and amusement devices.The system involves a substrate defining a marking surface, at least one visible stable dye, at least one normally visible reactive dye of a color different than that of the stable dye, an activator chemically isolated from at least the reactive dye prior to use of the system, and a solvent common to both the dyes and activator.