Geek Trivia: What Substance Is A Key Component In Both Black and White Photography and Jell-O?

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What Substance Is A Key Component In Both Black and White Photography and Jell-O?
  1. Gelatin
  2. Disodium Phosphate
  3. Fumaric Acid
  4. Citric Acid

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Source : Geek Trivia: What Substance Is A Key Component In Both Black and White Photography and Jell-O?

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