Darkrooms in the wet-plate era usually had a red or amber window, not a safe-
light. Safelights, I believe, made their appearance in the dryplate era
(1880s).
The current issue of The Collodion Journal is about poisons, and the next
issue, coincidentally, is about explosions.
Hope this helps!
France Scully Osterman, publisher (and wet-plate collodion photographer)
The Collodion Journal
sculloster@aol.com