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They both are deadly. I use cyanide to fix collodion plates as well. I
try keeping myself on guard of it, but I am mostly comfortable handling
it.Too comfortable at times.
The difference is how dangerous handling bromine is. More so in liquid
form than in material form. There are specific ways of handling it which
involves allowing the fumes seep into absorbent silica and use it when
it gets to a certain specific color to fume the plates. One does not even
need to open the bottle where the raw bromine material is, Just taking
the tape off the cork will be enough for fumes to come out. Usually that
happens with silica inside a bigger jar with rubber seal and locks on it.