Darkroom prospecting.
D004396:Coloring Agents; D006801:Humans; D010781:Photography / Q000295:instrumentation*; D011859:Radiography / Q000295:instrumentation*; D012834:Silver; D018030:Silver Compounds
D004396:Coloring Agents; D018030:Silver Compounds; D012834:Silver
PHOTOGRAPHY/apparatus and instruments; ROENTGENOGRAPHY/apparatus and instruments; SILVER