Admit it: you still wish you could pull out a coloring book, and make everyone have green tongues and purple hair again. With the fourteenth volume of the Color Ink Book ($10), you have a grown-up chance to do it all again. Each page features black and white art by different artists (this volume features work by The Chung!!) for you to hue-ify at your whim. And coloring outside the lines? Still allowed.
The color emerges as a function of the light energy that falls on the dye. Thus, if an optical brightener or color enhancer absorbs light energy and emits it through or with the dye, the appearance changes, as the spectrum of light re-emitted to the observer changes.