In view of the fact that many British potters were relocating to the Ohio 
Valley in the 19th century and bringing their techniques from Staffordshire 
to the old Northwest, have any of you found a good way to distinguish 
British-made from American-made yellow wares from the internal evidence of sherds, 
such as   paste or glaze differences?   Do you have references for these 
differences?
Thanks,
Bob Hoover