My recent Ilford FP4+ development times article seemed to cause quite a buzz. Mostly around the topic of “why would you even try to shoot this film at EI 6400?!”

I’m not really one for standing still and with that in mind, I’ve decided to publish my personal development times for Kodak’s Tri-X 400 from EI 200 all the way up to EI 25600.

As with the times published in the Ilford FP4+ article, the tables below show both real world tested and untested (extrapolated) development times for this film.

The times listed below may not work for everyone (differences in water quality/hardness/softness, agitation schemes, etc.), however I’ve yet to hear back that any of them were anything other than a success – here’s keeping fingers crossed.

The times below with ISO400 as the base speed (N). All other times vary from that as N+/- in full or fractions of stops

Ready? Here we go.



Kodak Tri-X 400 development times – EI 400

Exposure (EI)Pull/PushDeveloperDilutionTemp (°C / °F)AgitationTime
400NRodinal1+5021C / 70FSemi-stand (30 min)50:00
400NKodak HC-1101+19 (C)21C / 70F1st min + 5 secs each min02:45
400NKodak HC-1101+39 (D)21C / 70F1st min + 5 secs each min05:00
400NKodak HC-1101+79 (F)23C / 73F1st min + 5 secs each min07:45


Kodak Tri-X 400 – Rodinal 1:50 – EI 200-3200 – 21C / 70F

Exposure IndexPush/PullTime


Kodak HC-110 – 1+19 (Dilution C) – EI 200-6400 – 21C / 70F

Exposure IndexPush/PullTime


Kodak HC-110 – 1+39 (Dilution D) – EI 200-6400 – 21C / 70F

Exposure IndexPush/PullTime


Kodak HC-110 – 1+79 (Dilution F) – EI 200-25600 – 23C / 73F

Exposure IndexPush/PullTime



Have your say

Are there any times you were looking for not listed here? Just leave a note in the comments and I’ll update the article. The same goes for developer combinations.

Which film would you like to see next? Leave a note below and I’ll see what I can do.



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  1. Great ! Those times look more reasonable to me now. Is it the same case on your equally super useful FP4 page, that the 1+31 dilution is really 1+39 then? This would also make sense as ilfords time for 1+31 for FP4 seem way to long (9mins!!) .

  2. Many thanks for this ! This is is very useful. I am a hard-core HC110 user as well. Just to be sure: on the Kodak data sheet, “Dilution B” is normally 1:31 and Dilution C” is 1:19. So your dilution “C” is really dilution B :-), right? I noticed a similar problem on the FP4 page. Thanks again, H. !

    • Talk about messing things up!

      Sorry for the huge mix-up on this, my labelling was TOTALLY OFF. All references to dilution B are for an as yet un published table. The HC-110 tables should only cover C, D and F, which should now be correctly labelled and ordered.

      Thanks for pointing it out and helping remove some stupid from my process 😉

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