Re: ghost flash in the darkroom

["Christopher B. Moore" <cmoore@xxxxxxxxxxxxxxxxxxx>]

> From: Jaap Los <imagefotografie@xxxxxx>
> [...] When I tear the black covering paper from the actual filmroll
> (as you know it's fixed to the paper by a strip of adhesive tape) I
> noticed a light flash roughly coming from the spot where the film is
> fixed to the paper.

It has to do with the chemistry of the adhesive.  When the bond with
the film is broken, there are very weak flashes of light.  As you
noticed, they don't fog the film; after you've been in the dark for a
while, your eyes are much more sensitive than the film.  You can
duplicate the effect with (some kinds of) tape stuck to any surface or
by crushing sugar crystals in the dark.


Christopher Moore
cmoore@xxxxxxxxxxxx
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