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Wet collodion process

In 1851 Frederick Scott Archer introduced the wet collodion process.

Demonstration by Michael Gray (no sound track)

  • Bromide, iodide or chloride salts are dissolved in collodion (a solution of pyroxylin in alcohol and ether).
  • This mixture is poured onto a glass plate, and allowed to sit for a few seconds.
  • The plate is then placed into a solution of silver nitrate and water, which converts the iodide, bromide or chloride salts to silver iodide, bromide or chloride. 
  • The plate is removed from the silver nitrate solution, and exposed in a camera while still wet. 
  • It is then developed with a solution of iron sulphate, acetic acid and alcohol in water.

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Streaming video in Windows Media format. approx. 3 mins
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