Black and White Photography: A Basic Manual by Henry Horenstein
Author:Henry Horenstein
Language: por
Format: mobi
Tags: Equipment, Photography, Techniques, General
ISBN: 9780316373050
Publisher: Little, Brown
Published: 2005-04-19T21:00:00+00:00
Horenstein.09.Develop.128-159 3/11/05 12:00 PM Page 134
134
9
Developing Film
Changing bag. When a darkroom is not available, you can load film onto your processing reels and tank in a collapsible, lighttight sack called a changing bag.
It has a zipper opening and two holes that let you put your hands inside while keeping light out. You use the zipper opening to put the film, reel, and tank in, and then place your hands through the holes to load the film, without having to turn off the room lights.
You will need several different chemicals for processing film. All are packaged Chemicals
in either powder or liquid form, depending on type and brand. Although they are often more expensive, liquids are more convenient, easier to use, and generally safer to handle than powders. Powders must be mixed with water to make a stock solution, the form in which chemicals are generally stored. Chemicals that come packaged as liquids are, in effect, premixed stock solutions.
Some stock solutions are used straight (undiluted) but more often you must dilute the stock solution with water for use. The usable form of the chemical (whether diluted or undiluted) is called a working solution. Stock solutions generally stay fresh longer than working solutions, although many working solutions can stay fresh for months as long as they are stored in containers without much excess air inside.
Stock and Working Solutions
A stock solution is the form in which a chemical is stored; a working solution is the form in
which the chemical is used. If the chemical is
packaged in liquid form, you dilute it once
with water to make a working solution.
Powdered chemicals often need to be diluted
with water twice: first to make a liquid stock
solution and then again to make a working
solution. Some stock solutions are used
undiluted.
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