ph For Photography |
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| by Ted Peterson |
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| The photographic development process requires that developers be alkaline in order to activate the developing agents whereas fixer solutions and hardeners must be acid. |
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| Distilled water is assigned a value of 7.0 on the ph scale and is neutral, being neither acid or alkaline. Solutions are alkaline if they lie between 7.0 and 14.0 on the ph scale with 14 being the most alkaline. Each number represents a ten times increase over the next lower adjacent number. Solutions are acid if they lie between 7.0 and 0.0 being the most acid. |
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| To test the ph you can use a ph meter. These cost around $75.00 to $100.00 and unless you have a need for one you do not need to pick up one. You can use an item that does not cost a lot of expense if you want and will work as good but is a lot slower. The item is called ph paper. ph paper comes in all type of grades. Pick up the one that covers the part of the scale that you are working on. Like one from 5.5 to 8.5 etc. |
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| Most of the formulas that you make up for your darkroom, both color and black and white, will have the ph listed. This will be a ph listed that is the best for your operation. On some formulas you have to get the correct ph before they will work. Try to come up the one listed if you can. |
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Any Comments, Questions, or Inquiries:  E-Mail_w7wwg@jps.net
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