Well, that's two "I don't knows".
My apologizes on butting in on a conversation that I've not contributed to before, however it seems to me the answer to that question is rather germane to the topic at hand, as it is directly impacts the numbers and implications being brought forth here.
As for celluloid being a useful substitute, you are surely not serious. A more dangerous substance is not to be found that was in common usage.

Fiery Red