From: John Roseborough (jroseborough@dslextreme.com)
Date: 01/29/03-12:04:14 PM Z
Neil Miller wrote:
-----------
Hello all - after all the wonderful help I received fom this group with a
previous problem, I thought I'd try you with another. I am looking for
something to reduce negative density i.e., to reduce the thickness of the
emulsion layer on sheet film.
I have tried jewellers rouge on the end of a cotton bud and with lighter
fluid as a medium, but have had no luck. It just seems to polish the
emulsion (after prolonged rubbing) without really removing any of the
gelatin layer - it just seems too fine. I tried metal polish, too, with
marginally better results: it bites into the emulsion, but I have to polish
for such a long time and with such a force that I lose control over the area
of emulsion which I am trying to reduce.
I have also tried a very sharp exacto knife, but instead of "shaving off"
very thin layers it just removes all the emulsion right down to the film
base or it leaves darker "stress" marks.
The reason I am trying to this? To subtly retouch/remove small
blemishes/cliche verre.
------------------
Well you can try value grinding compound from your local auto parts supply
house. That should be much more course than jewelers rouge. The exacto
knife does work - that's what I used when I was etching negatives. The trick
is to be very gentle. The weight of the knife alone should be enough to
scrape away the emulsion. This should work with TX, HP5 and such - no
guarantees with thin super hard films like TMY.
Good luck,
John Roseborough
www.pyro4Hire.com
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