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.
Streaming video in Windows Media format. approx. 3 mins
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