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Once the latent image has been developed the light sensitivity of the daguerreotype plate is halted by fixing in sodium thiosulfate or ammonium thiosulfate, though Daguerre's original process used common salt.

Fixing Solutions

15 grams Sodium Thiosulfate and 15 grams Sodium Sulfite in 1 liter of distilled water.[1]

Common film and paper fixes can also be used.


  1. Pobboravsky, Irving. Study of Iodized Daguerreotype Plates, p. 42. Rochester Institute of Technology, 1972.
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