Over Developing Delta 100 For More Contrast

[braxus]

Guys. Im about to develop some Ilford Delta 100 in 35mm. In Xtol straight (only gives times for straight), it says 7.5 minutes. Its warm in here by about 5 degrees more, so I'll have to reduce the time. But even if at 21 degrees C, if I wanted a little more contrast in the negative then normal, so how much longer then 7.5 minutes should I do it for? What do you recommend or that I should try?

 

[Ben 4]

I've found that Delta 100 builds contrast quickly (though I don't use XTOL, so it your experience may be different). Try a 10% increase in time?

 

[braxus]

I've found that Delta 100 builds contrast quickly (though I don't use XTOL, so it your experience may be different). Try a 10% increase in time?

So like maybe an extra 30 to 45 seconds?

 

[Milpool]

Probably something like 15-25% extra time.

See what the Delta 100 tech sheet recommends for XTOL at EI200. Those sheets also have temp conversion times.

Kodak pub J-109 technically has what you are looking for (Delta 100 times for different contrast indexes at different temperatures, stock or 1+1).

Maybe split the difference between the Ilford and Kodak recommendations.

Don’t overthink it. Ballpark is plenty good enough. Or better yet just develop normally and increase contrast in printing / editing.

Guys. Im about to develop some Ilford Delta 100 in 35mm. In Xtol straight (only gives times for straight), it says 7.5 minutes. It’s warm in here by about 5 degrees more, so I'll have to reduce the time. But even if at 21 degrees C, if I wanted a little more contrast in the negative then normal, so how much longer then 7.5 minutes should I do it for? What do you recommend or that I should try?

 

[MTGseattle]

The Film Developing Cookbook 1998 edition says:

Delta 100 in Xtol

asa 25/50. 6.75 min
100. 8 min
200. 9.5 min
400. 11.5 min

There are no temps in parentheses, so I assume these are times for 20 degrees celsius.

 

[Ben 4]

So like maybe an extra 30 to 45 seconds?

Yes—I’d probably go with 45.

 

[braxus]

So I went with an extra 60 seconds, which makes it 8:30 at 20 degrees C. Because its 23 degrees inside, I finally went with 7 minutes developing time which was rounded off. Its slightly more time then needed for 22 degrees and 24 degrees was a big jump and its not that hot here. Its washing as we speak. I'll scan them up after it dries this evening.

Im developing other rolls today too, as its been neglected for many months.

 

[RalphLambrecht]

Guys. Im about to develop some Ilford Delta 100 in 35mm. In Xtol straight (only gives times for straight), it says 7.5 minutes. Its warm in here by about 5 degrees more, so I'll have to reduce the time. But even if at 21 degrees C, if I wanted a little more contrast in the negative then normal, so how much longer then 7.5 minutes should I do it for? What do you recommend or that I should try?

=+10-20%

 

[GregY]

Braxus, In my world it would depend on the dynamic light range of the scene. My standarad developer is Pyrocat HD.....& I've never been at a loss for contrast with either Delta 100 or Tmax 100.

 

[Ben 4]

So I went with an extra 60 seconds, which makes it 8:30 at 20 degrees C. Because its 23 degrees inside, I finally went with 7 minutes developing time which was rounded off. Its slightly more time then needed for 22 degrees and 24 degrees was a big jump and its not that hot here. Its washing as we speak. I'll scan them up after it dries this evening.

Im developing other rolls today too, as its been neglected for many months.

Looking forward to hearing how it went!