[mr.datsun]

Tri-X Reversal in D19. New EI/dev time tests. Stock at 20C.

You can see that even by 12m I have just reached a usable 100ASA. Increasing from 4m to 8m appears to give a one stop speed increase, The step from 8m to 12m did't gain that much. I estimate that I need 16m to get 200ASA.

The standard (most common) times for this combination seems to be 200ASA dev'd for 6-7mins in stock solution (source: numerous internet samples and anecdotal evidence even on this forum).

Why do I appear to need 2x or 3x the development to get a 'normal' 200ASA result for this film/dev combination?

(And seems interesting in light of the similarly dark positives I was consistently getting from Tri-X 35mm tested in PQ and Liquid Dektol)

Could there be something I am getting consistently wrong in my process (Permanganate bleach/Clearing sol from Foma kit. Same developer at half duration for 2nd dev)?

[You should be able to click through these to get zoomed in version:]

Attachment 65613


Attachment 65614

NB. Let me add that I'm pleased to be getting towards decent results but feel that something doesn't quite add up.