David, while everyone may be right here is what I understand your question to be and maybe some idea of what the different types of B&W prints are:

Silver Gelatin - which would include silver bromide, silver chloride and chloro-bromide.

Albumen - made with protein substrate - like egg whites.

Ambrotype - older process like albumen, I think image was on glass

Tin Type - like the name says, was in a way the first widely produce image type I think

There are others, I would suggest a visit to library or search on the net to find some of the others and new definitions (which you could post here for new discussions - only kidding). Hope this helps.