Mark,
Agreed. Just make the tests.
Coat, and expose from 1) the top, and 2) from bottom, and evaluate
the results.
If you do this well, you will need to vary the thickness and pigment
load depending on whether exposure is from top or bottom.
And I rest my case.
Sandy
>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
><http://www.precisiondigitalnegatives.com/>Precision Digital Negatives
Received on Wed Apr 5 22:16:30 2006
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