The divisions on this scale of veracity can be complex. There is an inevitable deterioration of the overall image quality by the progressive mechanical and chemical damages inherent in the printing process. A truly authentic print may rightly be that pulled by the artist or at least, done under their supervision. This is just one example of the potential complexity of authentication questions. Even if one only concentrates on monotypes there are sufficient problems to occupy most art professionals indefinitely.
Forgeries are relatively easy to detect.
However, the opposite is true for authentication. That may be a very thorny philosophic and scientific problem. However, we can do much to refine the process by which we might come to a more balanced approach. It is important to consider not only what professional disciplines are required to perform a reliable art authentication but what type of analyses would constitute an acceptable level of proof. Annual Meeting, Arlington, VA, June 1 - June 6, 1998.