red angels turn bright orange when hit with blacklight.. I wear a headlamp that has the blacklight
spectrum..so that this can be done... all red cards glow.. the black do not..they SHOULD glow in
BLUE...the best portable blacklight for the money is something called "stink free" takes 3 aaa
batteries.. and has a throw of at LEAST 20 ft... COST? $8-$12.....