A color toner is provided that enables printing of all colors, including black, either comprising one particle system that, depending on exposure to a particular wavelength, provides a desired color or comprising a plurality of layers, each of which provide a different color upon exposure to a different wavelength. The color toner comprises three layers, and, optionally, a base, or fixer, layer, each color layer containing separate color grain centers directed to a specific color, including color-sensitive silver halide (AgX) crystals, at least one developing agent, and color coupling chemistry. Advantageously, colors can be created or modified through the application of light (digital), as opposed to application of chemicals. Further, true black is obtainable with a single toner. Finally, image processing is mechanically and chemically simplified.