you should order Luis Nadeau's book "Modern Carbon Printing". It really is the
best manual available. From time to time he also does workshops. I don't know
wether Dr. Green in Corunna, Indiana still has Hanfstaengl carbon tissue to
sell. If not I may be the only one who still sells carbon tissue. If you want to
know more, please contact me offlist. (BTW: Drtikol also once used Hanfstaengl
tissues...)
Klaus Pollmeier