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Old February 23rd 14, 10:40 PM posted to rec.photo.darkroom
Jean-David Beyer
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Posts: 247
Default Film almost transparent

On 02/23/2014 11:54 AM, Richard Knoppow wrote:

"Franssoa" wrote in message
...
Hello,

Please excuse my poor English, I speak french.

I own a Lubitel 166B, and I've tested the Caffenol
processing.

I used the classic recipe (C-H), with a 1mn vinegar+water
stop bath (I need to buy acetic acid) and a 5mn fixing
using Ilford Rapid Fixer. The result was an almost
transparent film : http://hpics.li/d38c698

I tested my washing soda, and he have a 20% water. So I
tested a 2nd film, adjusting the washing soda quantity and
processing 16mn instead of 15mn... for an almost identical
result.

Is a transparent film a sign of a too short processing ?
Must I let the caffenol acting for a 30mn time to be sure
?

franssoa


It can be sign that the developer did not develop. If
there are edge markings on the film it indicates the film
was developed but not exposed, if no edge markings the
developer did not work.
I am skeptical of these odd developers. There are
plenty of conventional developers that work very well.


I do not remember who said it (Kenneth Mees?) that the plethora of film
developing formulae gives us many means by which identical results may
be obtained. Start with D-76d or something and change only if you need to.

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