[pure-silver] Re: drips on roll film
----- Original Message ----- From: "Shannon Stoney" <shannonstoney@xxxxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, November 30, 2007 5:46 AM
Subject: [pure-silver] drips on roll film
I have some bad drips on some of my roll film that I processed recently. I was shooting out in west texas where the sky is very pristine so the drips are very obvious. I think it might have something to do with the Photo flo. Like, maybe it was old or I didn't dilute it right or something. The reason I suspect the photo flo is that the drips run lengthwise on the film, not crossways, which would suggest a problem with pouring in the developer, or the stop or something.
Some of these negatives also have "holes" in the emulsion that print black. Not sure what causes that except for rough handling; but I was pretty gentle with them, I think.
Despite all these goofs, I got a few good images! I wonder how old I will be before I stop inventing new ways to screw up my negatives. 

--shannon
I also want to know what kind of film this was. Its the holes that bother me because they suggest a coating problem in manufacture. I use a final rinse made of Photo Flo and alcohol. The Photo Flo is at about half the recommended strength and the alcohol is isopropyl about 28ml of 99% or about 40ml of 70% per liter of rinse. If your water is dirty or heavily mineral laden use distilled water. Soak the film in this mixture for about 1 to 2 minutes and hang up to dry without squeegeeing. The mixture is a sort of super wetting agent. Streaking can come from a distortion of the emulsion from differential drying. Sometimes this is permanent but often resoaking the film in the wetting agent and re-drying will cure it. Sometimes one gets so called water spots. These are mineral deposits on the film usually in circular patterns around places water droplets have dried. They are rare where a wetting agent has been used. Water spots can often be removed by soaking the film in fresh stop bath for a few minutes and re-washing. A citric acid stop bath may be more effective. The pin holes strongly suggest its the film not the processing. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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