This is not the first mention of Daguerreotypes without mercury on this forum.
I call your attention to a portion of a PDF of mine on heliochromes posted by John Lewis 7 months ago.
They were made by coating silver plates for 3 minutes in 3.0 or 4.5% FeCl3 solutions which also
contained 2.2 or 2.6% CuSO4 respectively followed by a 5 second rinse in distilled water. Longer
contacts with water both before and after exposure were avoided.
These plates were exposed through a color transparency until a muted color image was visible.
When these plates were fixed in a solution of sodium thiosulfate, the colors completely disappeared, leaving behind a B&W Daguerreotype image, produced not only without mercury but without nasty iodine bromine or chlorine fumes.
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