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#1
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Heating D-76 Hotter Than 53 C
Is it a bad bad thing to heat my D-76 sol'n above 53 C when mixing the
crystals or is 53 just the right temperature for dissolving the crystals? Thx. |
#2
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Heating D-76 Hotter Than 53 C
SofaKing wrote:
Is it a bad bad thing to heat my D-76 sol'n above 53 C when mixing the crystals or is 53 just the right temperature for dissolving the crystals? Thx. Metol is supposed to degrade quite quickly at temperatures above 125F (52C). I don't think I'd worry about a few degrees, but it is a good idea to use a thermometer. Normally when you mix developers with metol and sulphite, you have to add most of the sulphite after the metol. Sulphite acts as a preservative, but it also prevents metol from dissolving. Kodak powdered developers appear to have additives which get around this problem so that all the ingredients can be added at once. The large amount of sulphite may make the high temperature less of a problem. Note than I am trying to answer questions as a learning exercise for myself. I sure hope Richard or someone corrects me if I'm way off. Peter. -- |
#3
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Heating D-76 Hotter Than 53 C
"SofaKing" wrote
Is it a bad bad thing to heat my D-76 sol'n above 53 C when mixing the crystals or is 53 just the right temperature for dissolving the crystals? Thx. The cooler the better. Use distilled water. 53C is not a magic temperature. Most formulas mention 125F or 53C when lower temperatures, even room temperature would do. I think some use D-76 at no dilution. It's a thin brew as mixed and can be used undiluted. Contrast D-76 with HC-110 or Rodinal or some others where dilutions of 1:25, 1:50, 1:100 and even higher are used; D-76 1:1 or 1:2. D-76 was compounded to be used as an undiluted replenished developer; that is, to be used time and time again. Do you use it one-shot or do you replenish? Dan |
#4
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Heating D-76 Hotter Than 53 C
One shot. So far my new chemistry has held up, I was a little hotter than
54, I think Kodak says 52-55 though. I processed my first B&W roll today. Ahhhhhh. "Dan Quinn" wrote in message om... "SofaKing" wrote Is it a bad bad thing to heat my D-76 sol'n above 53 C when mixing the crystals or is 53 just the right temperature for dissolving the crystals? Thx. The cooler the better. Use distilled water. 53C is not a magic temperature. Most formulas mention 125F or 53C when lower temperatures, even room temperature would do. I think some use D-76 at no dilution. It's a thin brew as mixed and can be used undiluted. Contrast D-76 with HC-110 or Rodinal or some others where dilutions of 1:25, 1:50, 1:100 and even higher are used; D-76 1:1 or 1:2. D-76 was compounded to be used as an undiluted replenished developer; that is, to be used time and time again. Do you use it one-shot or do you replenish? Dan |
#5
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Heating D-76 Hotter Than 53 C
"SofaKing" wrote
One shot. So far my new chemistry has held up, It was a little hotter than 54, I think Kodak says 52-55 though. I processed my first B&W roll today. Ahhhhhh. Good for you! Nice to see today's electronics has not stolen the whole show. One liter of stock strength D76 should be good for four liters of working strength. If one-half liter is used each roll, that one liter of stock will process eight rolls. What size film are you processing? What dilution did you use? What volumn of working strength developer? Dan |
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