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D-76 dilution 1+1 vs 1+3


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<p>I will go out on a limb and say that for many folks; straight , 1:1 and 1:3 D-76 look about the same. (as far as the negatives go). <br /> <br /> Thus sometimes folks use a more diluted brew to:<br /> <br /> (1)save money;<br /> <br /> (2) or where the processing times are too short because of a warm darkroom.!<br /> <br /> With the Nikkor 4x5 stainless tank here; it has a long fill time. Thus many times I uses a more diluted brew so the fill and dump time is not a huge portion of the total development time.</p>

<p>***ie dilution varies development time alot and is more suble as to grain and sharpeness!</p>

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<p>A developer's response to dilution depends on several factors, including, but not limited to: developing agent/agents, their ratio to one another, alkali type, buffering, and concentration, restrainer type and concentration, developing capacity, film being developed, and even the type of scenes photographed. There might be a developer for which John's theories hold true, but I caution against applying them too broadly or confidently to any developer. </p>

<p>Developer capacity is the first value you should know in order to calculate viable dilutions of any developer. These minimum volumes of stock solution are published by manufacturers, and going off the top my head (perilous at best), it seems D-76 is around 200ml, hc110 is 30ml, and Rodinal is 25ml. I could be wrong about any or all of those, but I think I'm close. The minimum volume of 510-Pyro concentrate required to develop 1 36 exp roll/ 8x10 sht is 1ml (that one I know). </p>

<p>I don't think many people would see much difference in prints made from negatives developed in D-76 1+1, 1+2, or 1+3, unless something goes pear-shaped due to developer exhaustion, or some miscalculation, and the only reason to use a dilute developer for rotary processing that makes sense to me, is to extend development time. Developers like D-76 and Xtol that are used full strength for short-normal development times can be inconvenient for rotary processing if one depends on dilution to extend development time. A 35mm JOBO drum requires 140ml of solution, which is below the minimum volume of stock D-76 required for development capacity. The minimum stock (200ml) diluted 1+1 makes 400ml of developing solution, which is more than the tank will hold (300ml). A more concentrated developer is more convenient for rotary processing with small solution volumes. </p>

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