Keywords: Photochromic dye transition.png w Photochromism an example of a dye structure transition Author date of creation selfmade by Shaddack 1 January 2006 Source self-made adapted from http //www colorchange com/Photochromic 20Reversible 20Technology htm Copyright Public Domain PD Comments b/w hires PNG; ChemDraw Dyes Spiro compounds 2006-01-02 own assumed Shaddack |