I confess to backformations, scraping bottom of barrel.Stretching things a bit:
pink,tan,fade,sallow,inflame,stripe,ensanguine,clarify,freckle,cyanose,glow,luminesce,irradiate,fluoresce,scintillate, coruscate,opalesce,exsanguinate,wan, and as a joke, litmus - chemical test, changes color with pH.