It's black when it's not in use, it's red when it's in use, and it's grey when you're done using it. What can this be??

coal seems the obvious cj=hoice, but what about a black and white photograph, starts off black, then turns red (due to the red light in most developing rooms while in use), and a grayish color when done.

Posted by Jon on 2003-05-09 09:20:28