BnW reversal attempts

Hmm, having seen those negatives in person I would definitely not say those are flat. The photo doesn't really do them justice. Perhaps the light source is not bright enough to cope with the density?

@YoIaMoNwater, @Raghu Kuvempunagar I did not note exactly where I took the readings as I moved the densitometer around the frame to find the range of values. But the Dmin would certainly have been the center of the lamp on the thinnest frame. I would then have taken the darkest reading on the same frame for Dmax. I did not see the other strip of film, only the one with the lamp.

Note that it looks like it was probably measured on the +3 frame.

I have to say that the TMax100 I sent to @relistan was the first attempt with 8 min bleach that resulted in emulsion damage. The numbers he got was from that roll. The most recent trial with 5 min bleach looked darker which probably made it look more mute. I don’t have more TMax100 and am on a budget so it’s unlikely I will continue to test this particular film.

Anon Ymous said:

@Donald Qualls There's also the possibility to acquire nitric acid from agricultural supplies stores. Not available from any of these stores, but some may stock it, among other fertigation supplies.

Click to expand...

I happened to Google for nitric acid today, and found it's apparently fairly inexpensive and widely available, just not from Amazon sellers (which is the first place I look these days), and not (AFAIK) from Home Depot or Lowe's. I might order in a small bottle of one of the lower strength solutions, just to try it on a fogged, developed leader as a start.

Film Washi F @100 with 8 min bleach: Dmax is visibly very low and bleach time needs to be reduced. Because this film lacks the anti-halation layer, the reversal process effectively makes this film to be highly light sensitive.



Delta100 @100 with 5.5 min bleach: I messed up exposures for the lamp so the -3 is -2. Will update the image tomorrow.



FP4+ @125 with 8.5 min bleach:

TMax100 @100 with 5 min bleach (constant agitation): Seems like my theory of constant agitation during the bleach step worked. To be honest, I am still not a big fan of this particular film for reversal.




TriX @400 with 10 min bleach (constant agitation): Much better than last trial with obvious higher Dmax; however, bleach time was still not enough.





Delta100 @400 with 9 min bleach: