The last couple of weeks I have been trying to make gum prints, but the gum would not come off. ( not even when using water instead of Kbichromate and not exposing before developing. ) I have been experimenting a lot and now think my conclusion must be that the gum I bought is not fit for gum printing. I am posting here, because I can hardly believe this conclusion to be the right one; does that exist? When I dissolve 300 gram of this gum lumps ( very different in size and color) in 1 liter water I end up with a gum solution that has a viscosity of >>>>50 Baume instead of the 12.5 - 14 that should be. I have to add another liter of water to reach the needed viscosity. But then apparently I have a solution that is different in some way from the one needed? Has anyone have similar experience with gum lumps?