Quote Originally Posted by scootermm
thanks for the info Don and Michael

have another one for you who are more experienced.

are any of these colors to be avoided because of staining or just not being conducive to gum over printing?
These are the colors I purchased:
Terre Verte
Olive Green
Green Gold
Burnt Umber
Burnt Sienna
Indian Red
Perylene Maroon
yellow ochre
naples yellow
new gamboge
cobalt blue
cerulean blue
nuetral tint
ivory black

all are winsor & newton
FWIW,

I've never had staining doing gum overs (up to 3 layers) with these colors by WN:

Green Gold
Burnt Umber
Burnt Sienna
Perylene Maroon
Indian Yellow

With M. Graham:

Burnt Umber
Burnt Sienna
Raw Sienna
new gamboge
cobalt blue
Alzarin Crimson
Q. Violet
Sepia
Ultramarine Blue

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.