You say "Here, here! Carole Hollander's advice certainly mirrors my experience
years ago in gum. You mUST do much pretesting of pigment-paper combinations at
various pigment concentrations or else you are shooting in the dark and will
only achieve success through blind luck or divine intervention...."
This seems to an American received opinion reflected in many articles and books.
But like most received opinions and books on gum printing, it, thank the lord,
is just not true.
Once one understands why and how the process works it becomes clear that testing
pigments against papers beyond the advice of the manufactutrers will not add to
one's practical knowledge.
Terry King