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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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PHOTOCHEMISTRY MEASURING & MIXING xx PHOTOCHEMISTRY Balancing temperature and dilution when mixing working solutions of developers from stock. How to simultaneously dilute and achieve the correct working temperature. Tip on dissolving powdered chemicals in water using an Erlenmeyer (conical) flask. Choosing and using darkroom tools. Looks at liquid measuring containers, thermometers, balance scales, etc. Formulas for adding cold water to warmer tap water in order to get the correct processing temperature for photochemistry. Tip on using an oral syringe to measure small amounts of photochemical concentrates. Tips on determining if too-hard or too-soft water is affecting your photo chemicals. Tips on storing dry photo chemicals and mixing and using dry chemicals which have absorbed moisture (caked). Includes tips on avoiding caking. Impact of water containing chlorine, iron, calcium, or bacteria on photographic chemicals. Tips on calibrating and using a pH meter in photographic work. Tip on the impact of softened water when formulating color negative film developers. Managing your color photochemistry. A good gravimetric balance scale is essential to the economic formulation of solutions needed for color processing. Tips on mixing technique and minimum mixing time for photo chemicals. Tips on using and rejuvenating a pH meter used with photochemistry. Advice on water quality and the use of distilled or deionized water for the mixing of photochemistry. Water purity for film processing. (1) Water quality for processing consistency. (2) Effects of soft or distilled water on emulsion. Removing sulfur from a water supply that will be used in photographic processing. Tip: Purchase 1 oz. nose drop dispensers from a druggist for use in holding premeasured amounts of color chemical concentrates. Tip on converting chemical weights from one hydrated state to another when mixing your own chemicals. Make a chemical mixing tube for use with a motorized print roller base. Tip: Use 60cc hypodermic syringes to measure small quantities of liquid photo chemicals. Tip: Use 1-gallon containers of distilled water to mix and store photo chemicals. Tip: Paint mixer, but not blenders, can be used to mix photo chemicals. Tips for consistently measuring photo chemicals. Confusion over the concept of chemical "dilution" is explained. Tip on letting the wind do a thorough job of mixing powered chemicals with water. Darkroom calculations. Using a pocket calculator to ease your darkroom tasks. Looks at temperature conversion, volume conversion, dilutions, etc. Tip on mixing small quantities of film developers without fear of cross-contamination. Tip on reducing the effort involved in mixing photo chemicals to ensure reproducable results. You can mix your own photo chemistry. Both volume and weight techniques are described. How to mix your own photochemistry. An introduction to measuring, mixing, and forumulating. Tips on mixing and storage of photo chemicals. Advice on mixing photo chemicals which will result in more consistency and fewer mistakes. Opening and pouring dry photo chemicals inside a large plastic bag can help keep them out of the air and out of your lungs. Use a postal scale to measure photo chemicals. Use several labeled plastic pill containers to hold the various color chemicals needed when using daylight drums. Tips on mixing and storing color processing kits. Tip: Small plastic pill bottles make graduates for small amounts of replenisher. Tips on using a magnetic mixer to maximize the uniformity of your solutions. Tip: Make your own clearly labeled, single-purpose beakers for holding pre-measured chemical solutions, from translucent plastic pill bottles. Build this inexpensive battery-powered mixer. Tip: Draw and store tap water in advance for use in photographic processing. This reduces the amount of oxygen in the water. Use 35mm plastic film canisters to hold enough Microdol X powder for mixing ten ounces of developer (enough for one roll of film). Simple formula for determining how much water to add to a chemical of known concentration to arrive at a mixture of desired concentration. Tip on dealing with hard water metallic sulfites and sulfates in film developers mixed from powder. Use of dehumidifier water in photochemistry is discussed. Tip: Convert a Kodak Rapid Fix "A" bottle with one ounce markings into a graduate. Save money on chemical costs. Understanding the potential cost-cutting advantages of buying photo chemicals in bulk. Explains how to divide the larger quantities into smaller units for storage and use. Chemical balance (scale) for weighing photographic chemicals. Est. cost: $18. Tips on the proper mixing of chemicals. Reasons for mixing your own photo chemicals. Tips on proper mixing of powdered chemicals. What you should know about containers for measuring chemicals. Tip on using oral syringes to measure small amounts of photo chemicals. | |||||||||
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