Chuck Guzis wrote:
  Silver is still used in photography and much is
still used for
 radiography. 
 Argh, Silver Halide film emulsions. I'm surprised I didn't get that
 one... I spent most of last week mixing ID11 and Rapid Fixer. Good fun.
 Until you forget to measure the temperature of the developer,
 under-develop the film, and don't wash it enough in the stopbath to
 remove the anti-halation dye. Then for bonus points I caught the film on
 the worktop and ripped half the emulsion off.
 ID11 and Delta400 are not forgiving. Not in the least. At least HP5 is a
 bit more idiot-proof.