> Judy Seigel asked me to elaborate. I literally took some clam
> chowder home from a restaurant, ground it up in a blender, added
> an equal amount of ammonium dichromate, painted it on a page
> and exposed it under a large negative to sunlight. I think I used
> a powdered rock as a pigment.
> .....
> olive color, so this was a very primitive experiment.
I somehow feel it is the starch that is used to thicken the soup rather
than the clam that made the process work....