I didn't understand much of the discussion about printing clear gum
arabic, partly because I didn't understand it, partly because I didn't
think I needed to understand it, and partly from suffering from turkey
poisoning. But I think one point needs to be made -- or repeated:
Results with plain gum arabic and dichromate without pigment will NOT
replicate results *with* the pigment. Or let me correct that to say, I
doubt that they would or could.
That's because a really heavy coat of pigmented gum will block up in the
shadows -- the bottom 4 or however many steps will APPEAR to be only one
step. I would assume that counting steps in the test without pigment you
would count from the bottom to the top, which would be many more steps
than with the blocked up pigment.
There would probably be some dichromate staining in the no-pigment test,
which might faintly imitate the effect of pigment, but not as strong.
If you're hellbent on counting steps no matter what, I suppose you could
take the highest step reached and call that the number of steps, but... so
what? Doesn't help with an *image* which could come out in only two tones
-- the plugged-up color & paper white.
Judy
Received on Wed Nov 30 23:47:01 2005
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