Originally Posted by scootermm
I've never had staining doing gum overs (up to 3 layers) with these colors by WN:
With M. Graham:
But with higher pigment loads (much more than you are probably using for gum overs) certain colors seem prone to staining with strait gum prints. Particulary the violets, ivory black and some reds.
What doesn't stain for me may cause staining for you (or vice versa) due to different methods of sizing, esposure times, and dichromate loads.