Re: ghost flash in the darkroom

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 11:12 am +0100 16/2/98, Christopher B. Moore wrote:

>> 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.


Tearing the bond on self-sealing envelopes the effect can be seen in daylight!



All the best,

              Clive   http://clive.bel-epa.com


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