Posted By:
HanrkonOkay, Dan, I understand.
Keep an eye on the frequently updated page. There currently is not a tip on this particular subject posted, but there will be in the near future.
http://www.cycleback.com/quicktips.html
For a substantially more in depth and diverse recource to examination of prints in general (fine arts to collectables), refer to the below link. Don't worry, I'm not silly enough to think that anyone here will actually read the whole thing-- but some may parts here or there useful for reference at some point or other.
http://www.cycleback.com/printsexamination/index.html