I took a gum printing workshop awhile back and learned some basics and made some successful prints. I am now trying to pick up where left off and make some prints on my own. I have been following the procedures according to my class notes and Christopher James book. I made several exposures using my platinum exposure times as a baseline and then successively longer exposure times. With all of the prints all of the gum washed off almost immediately and I am getting no image at all. I suspect that it is a problem with the gum or the sensitizer but I don't want to just start ordering new supplies without at least some idea of what might be wrong. Any suggestions would be appreciated.