<< I would also like to know if there is someway of dating them. When were tintypes likely to have been used? >> Besides Classy Images here is another site that might help(below) .. scroll to the bottom . As far as restoring tintypes... thats a good question .. I havent heard of this being done on the actual tintype .. Digital yes... .. check Cyndislist.com scroll down to the Photograph section and look under "restorations" .. If the answer isnt there then probably it dosen't exist http://www.ajmorris.com/roots/photo/types.htm <A HREF="http://www.ajmorris.com/roots/photo/types.htm">Photo Types</A> Good Luck Joe Bott DeadFreds Genealogy Photo Archive http://www.deadfred.com