Re: Pinholes in HIE

[Daniel Cardish <dcardish@xxxxxxxxxxxxx>]

At 11:30 PM 11/9/96 +0100, you wrote:
>John Sparks wrote:
>> 
>> Last weekend I developed my first sheets of 4x5 Kodak ir film.
>> Everything looks pretty good except I got a number of black dots in the
>> negatives.  These are not the typical dust blobs you often get with
>> sheet film.  When I look at the film with a loupe, it looks like the
>> emulsion erupted away from the film base.  My first guess is that it's a
>> reaction between the basic developer and the acidic stop bath (I think I
>> was using a fairly weak stop bath) and I was using much diluted Tmax RS
>> (1:9 at the times listed on the IR homepage).  Anyone seen this (even
>> with the 35mm HIE)?  Any recommendations?  Do most people use a water
>> rinse instead of stop with HIE?

I've experienced this with 35mm IR many times.  I believe that they are
caused by small air bubbles clinging to the film.  I notice it more in the
winter than the summer, due I suspect to the lower humidity (and thus higher
static electricity) in the air.  Perhaps the mylar film base is more
susceptable to this than conventional film.  
>> 
>


Dan Cardish  
<dcardish@xxxxxxxxxxxxx>

<http://www.spherenet.com/dcardish/photo.htm>
        


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Topic No. 5