Re: two questions about gum
On Sep 25, 2007, at 4:54 PM, Katharine Thayer wrote:
(1) Charles, this makes sense; there's enough size in most
watercolor paper as manufactured to keep the first layer from
staining, but subsequent layers on unsized paper (depending on the
paper) could well stain.
(2) I don't know that there's a rule of thumb for how to deal with
this; people do whatever works for them, I suppose. If cutting
the exposure time works, great. I can imagine that a drastic
reduction in exposure might a similar effect to a reduction in
pigment, but I've never tested that.
On reflection, I doubt the effect is the same; with underexposure it
seems like you would be more likely to lose highlights than you would
with a reduction in pigment.