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Silver nitrate.
The autochrome was the first reasonably succesful process that was widely used. Patented in Europe in 1903. The processed was used by the photographers hired by Albert Kahn to document the world as it was then
orthchromatic emulsion
Polonium is not used in photography.
If you used coloured water, it will change the colour of the petals.
Photoflash
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No, silve nitrate is used in photography
aluminuim is used in flashlight photography
This compound is sodium hypochlorite - NaClO.
table salt unless the recipe says otherwise
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