Is there a way to calculate dev. time when going from a 1:1 solution to a 1:2?
i.e. If I'm developing Tri-X in Xtol 1:1 for 8'30" how do I calculate my dev. time for a 1:2 solution?
Thanks
T
Is there a way to calculate dev. time when going from a 1:1 solution to a 1:2?
i.e. If I'm developing Tri-X in Xtol 1:1 for 8'30" how do I calculate my dev. time for a 1:2 solution?
Thanks
T
Go to here and click on "The Massive Dev Chart" link select your film and Xtol, you would get your times for 1:2 dilution.
Cheers,
Hi,
I know about digital truth but my question was more about a "rule of thumb" existing.
I guess I should've been a bit more clear.
Thanks
T
Actually, there is. For continuous agitation, development time to reach the same density in the negative varies by the square root of dilution. So, if you have a five minute time for stock, and you dilute it 1:1, your new time is 5(sqrt(2)) = 7 minutes.
With intermittant agitation you can guess that doubling dilution also doubles the time. More or less. It depends on how you agitate, but this will put you in the ball park.
With stand development, all bets are off. Experiment and see.
Bruce Watson
Sweet!
Thanks.
T
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