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The most difficult history of pho­tog­ra­phy riddles

A list of history of photography related questions that are most often answered incorrectly
Photography quiz
Which resource used to be greatly consumed by the photo processing industry before the age of digital photography?
oil
silver
cadmium
zinc
Photography used 31% of the silver consumed in 1998. By 2010, it dropped to 7%.
Jason Beagley
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