[rollei_list] Re: was Rollei Retro Film now is Rodinal pin holes

The sox should do it.  I wear grey wool socks exclusively when I develop my
film.  :-)
On 2/25/08, Dennis Purdy <dlp4777@xxxxxxxxxxxxx> wrote:
>
>
> On Feb 25, 2008, at 08:44, Richard Knoppow wrote:
>
> >     Real pin holes are very rare. They are actual physical
> > disruptions in the emulsion caused by gas formation. First
> > of all mot films are hardened to the point where such
> > disruptions would require very extreme conditions to form,
> > if at all. Secondly, few film developers contain carbonates
> > these days and its the effervescense of carbonate that
> > caused the problem in the old days. Rodinal contains
> > hydroxide which I don't think causes outgassing.
> >     It is possible for apparent pin holes, that is clear
> > spots, to form because of dirt on the film during
> > development or because of small bubbles of air stuck to the
> > surface. The last do not usually show up as pin holes but as
> > "air bells" small clear areas with a dark surrounding.
> > Jarring the film tank on the bench a couple of times after
> > filling it usually knocks off any bubbles but they can
> > survive normal agitation if not knocked off.
> >     Pin holes can be the result of a coating problem. This
> > happened to T-max films a couple of times and Ilford has had
> > the problem but I have not heard of anything recently and
> > its pretty rare.
> >
>
> Well, given those facts and given the fact that at least on this one
> roll of film I have tiny clear spots visible mostly in the sky.  About
> 20 spots total.  I have to conclude that somehow I caused the pinholes.
> They are way too small to be air bells and I never get air bells in my
> processing tank.  I think the dirt possibility is very unlikely as the
> pin holes are very tiny and seemingly uniform in size and I have never
> had a dirt problem and with fresh Rodinal and a fresh cleaned
> processing tank I just don't see it.  So I guess I am down to bad film
> coating at Fuji.  I hope not because I have over 200 rolls of the same
> emulsion.   The only other time I have seen pin holes exactly like
> these is when I tested out some 120 EDU film from Freestyle a couple of
> years ago.  I guess I will try a plain water stop bath and maybe a
> different colored pair of socks.  Seems like another of photography's
> unexplainable phenoms.
>
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