[pure-silver] Re: drips on roll film
- From: "Nicholas O. Lindan" <nolindan@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 30 Nov 2007 17:15:36 -0500
"Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
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.
Ditto here. 1:20 in 90% isopropanol for a stock solution,
then 1:20 in steam distilled water for working solution.
Finger squeegee. No spots.
I often leave the film in for ~5 minutes to
get the final bit of purple out - which also gets the
final bit of calcium et. al. water salts out of the emulsion.
The pre-dilution makes it much easier to measure out
the PhotoFlo. I find if I pre-dilute it to working
strength in a gallon of distilled water I get
biological growth in the jug after a few weeks.
==
Nicholas O. Lindan
Cleveland Engineering Design, LLC
Cleveland, Ohio 44121
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