Dev. times for hp5, dillution b, & tri x

[mojobebop]

Altho, I have developed a couple of thousand of rolls since
high school, I have taken a several year hiatus from b&w.

Shooting digital has made me yearn for film once more.
I have forgotten the dev times. (they no longer come with film purchase).


Looking online, I'm uncertain if times are correct.
Is there an absolute source from whence one can determine this?

 

[Bob Michaels]

There is no absolute source for b&w film developing times as it is a personal choice and related to exposure.

But you can download the data sheets from Ilford and Kodak that will give you good starting times plus more useful info. Or, you can just look at Digital Truth for some times.

I could tell you my HC-110 HP5 & TriX times but that is just what works for my exposure methodology, agitation technique, and a number of other variables. So it probably would not work as well for you as for me. So start with the Ilford & Kodak suggestions rather than what any one here tells you.

 

[charjohncarter]

I agree with Bob but this is what I do with TriX. I expose TriX at 250 EI, then develop in HC-110h (not B, but B is generally half H), I develop for 11.5 minutes, 30 seconds initial agitation, then 3 inversions on each minute, 68 degrees.

This was done that way:

 

[40oz]

Here's a link to Kodak's PDF on Tri-X:
http://www.kodak.com/global/en/professional/support/techPubs/f4017/f4017.pdf

Here's a link to their PDF on HC-110:
http://www.kodak.com/global/en/professional/support/techPubs/j24/j24.pdf

Here is a link to Ilford's film/developer time chart:
http://www.ilfordphoto.com/Webfiles/2006216122447.pdf

As stated in the PDF's, times under 5 minutes are not really recommended, as it is tough to be consistent. Per Kodak, if you want a longer dev time with HC-110, use half the concentrate and double the time. Using dilution B as a starting point, mix 1+63 and dev for 7.5 minutes (simply a starting point - adjust for up or down to get the contrast that works for you). The PDF's state a dev time of 3.75 minutes for Tri-X 400 in Dilution B, so since we are using a dilution half that, start with twice the dev time.

Develop longer if you don't think the negatives have enough contrast between the highlights and shadows. Develop too long, and you lose detail in the highlights. This would be called "pushing" if you purposely under-exposed the film, otherwise it's called "over-developing" 🙂

 

[projectbluebird]

http://www.digitaltruth.com/devchart.html

A very, very large chart of many developers and films. Usually a good starting point.

(my personal preference for HP5, ASA 200, 5 min @ Dilution B)

 

[le vrai rdu]

Altho, I have developed a couple of thousand of rolls since
high school, I have taken a several year hiatus from b&w.

Shooting digital has made me yearn for film once more.
I have forgotten the dev times. (they no longer come with film purchase).


Looking online, I'm uncertain if times are correct.
Is there an absolute source from whence one can determine this?

this a small website created by a guy I met on a french photo forum. You will find there some informations

I know the people who gave the datas , with some picture as examples