LightWriter85
9-Feb-2012, 20:16
Hello,
I am experimenting with different dilutions and development times with HC-110 and Ilford Delta 100. On this web-site (Covington Innovations (http://www.covingtoninnovations.com/hc110/)) it mentions that dilutions D and E require 25% and 50% more development time than dilution B because "With this developer, development time is roughly proportional to dilution," and indeed, dilutions D (1:39) and E (1:47) are 25% and 50% more diluted than B.
The development time for dilution B with HC-110 is 6 minutes, leaving me to believe that the times for D and E would be 7.5 mins and 9 minutes respectively. Since dilution H is 1:63, or 100% more diluted than B, my assumption is that dilution H would require approximately 12 minutes, or double that of B.
There is a thread on this forum where someone was complaining about low-contrast negatives with dilution H and Ilford delta 100 after developing for 10 minutes, perhaps this would not have happened if development would have been 12 minutes instead.
I suppose my questions are: 1) Is it safe to assume that the correct development time for dilution H, in this case, would be 12 minutes, 7.5 mins for D and 9 minutes for E?
2) On the Massive Dev Chart (http://www.digitaltruth.com/devchart.php?Film=Delta+100&Developer=HC-110&mdc=Search) for Ilford Delta 100 and HC-110 it only has one other dilution listed which is E, and it says it should be developed for 7.5 minutes, which would be the time for D if my assumptions are correct. Is this a mistake on their part?
3) Is it a better idea to use the same brand developer as the film used? In this case using Ilford developers for Ilford film?
I appreciate the help if available. Thank you.
I am experimenting with different dilutions and development times with HC-110 and Ilford Delta 100. On this web-site (Covington Innovations (http://www.covingtoninnovations.com/hc110/)) it mentions that dilutions D and E require 25% and 50% more development time than dilution B because "With this developer, development time is roughly proportional to dilution," and indeed, dilutions D (1:39) and E (1:47) are 25% and 50% more diluted than B.
The development time for dilution B with HC-110 is 6 minutes, leaving me to believe that the times for D and E would be 7.5 mins and 9 minutes respectively. Since dilution H is 1:63, or 100% more diluted than B, my assumption is that dilution H would require approximately 12 minutes, or double that of B.
There is a thread on this forum where someone was complaining about low-contrast negatives with dilution H and Ilford delta 100 after developing for 10 minutes, perhaps this would not have happened if development would have been 12 minutes instead.
I suppose my questions are: 1) Is it safe to assume that the correct development time for dilution H, in this case, would be 12 minutes, 7.5 mins for D and 9 minutes for E?
2) On the Massive Dev Chart (http://www.digitaltruth.com/devchart.php?Film=Delta+100&Developer=HC-110&mdc=Search) for Ilford Delta 100 and HC-110 it only has one other dilution listed which is E, and it says it should be developed for 7.5 minutes, which would be the time for D if my assumptions are correct. Is this a mistake on their part?
3) Is it a better idea to use the same brand developer as the film used? In this case using Ilford developers for Ilford film?
I appreciate the help if available. Thank you.