Sandy,
I was up all night trying all sorts of manual tests to see if it hardens from
the top down or the bottom up. I did not think of exposing it from the
back......That is quite clever...Some of the thin tissues or vellums might work
quite nicely that way.
but in all seriousness..... I think Keith Gerling and others have coated
paper with multiple coats of DIFFERENT COLOR Pigment & gum and let each coat dry
and then exposed them all at once.... so, wouldn't that show on a step wedge a
gradation of color? If the least exposure on the step wedge came up with the
bottom color, then it would be bottoms up.... if the top coat hardens (and
maybe sloughs off) then that would indicate the opposite ...
I'm on the road and won't be home for another week or so... but then Canyon
De Chelly is a lot prettier than home.
Mark Nelson
Precision Digital Negatives
Received on Wed Apr 5 21:33:57 2006
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