My PC-512 Borax Developer

[Andrew O'Neill]

 

[mshchem]

Hey, how can you be in a convenience store in Japan and Canada at the same time??

Enjoy your trip!

Best Regards Mike

 

[relistan]

Thanks for the video, @Andrew O'Neill ! Left you a comment there. Thanks for posting

 

[Alan Johnson]

Hello @relistan, some of the development times listed for PC-512 Borax would be a bit short for hot weather.
Did you ever try it half strength 1+1 with a time increase about 1.25 to 1.3x longer from results with other developers? Just trying to get a time multiplier for 1+1 compared to 1+0.

 

[relistan]

Hello @relistan, some of the development times listed for PC-512 Borax would be a bit short for hot weather.
Did you ever try it half strength 1+1 with a time increase about 1.25 to 1.3x longer from results with other developers? Just trying to get a time multiplier for 1+1 compared to 1+0.

Hey @Alan Johnson no, I haven't tried that. In Ireland it's more or less never hot! 23C would be a very hot day here. @Andrew O'Neill has some times posted for 1+100 dilution, and it seems to work like that. His times seem like they are 25-50% longer. He can probably comment more. I do not know what effect that might have on the grain behavior. I also don't know what effect using more borax solution and less concentrate will have on the pH. If you mean to dilute with water, but same ratio of borax:conentrate, then obviously the pH wouldn't be an issue.

 

[Alan Johnson]

For the case where development temperature is high, I tried developing at half strength (49 Borax soln + 1 PC-512 +50 water). Half strength in this case is not the same as 1:100 ( 99 Borax soln +1 PC-512 ).
An increase in development time of about 80% compared to that for normal PC-512 Borax was found to give a negative density closely matching.
On A3 inkjet prints the grain from both was not detectably different, and fine.
The half strength solution result gave the half strength solution as slightly sharper in this single test.
Above results were for FP4 type 517 cine film used in the test.

At 25 C the time for FP4+ is increased from 4m14s with PC-512 Borax to 7m 38s using the half strength solution.

Massive Dev Chart Film Development, Film Developing Database

www.digitaltruth.com

 

[boring old man]

I used semistand often at my old house, my tap water came out around 26 in winter. In summer I was lucky to keep the house that cool, AC worked to keep it at 29 some days.

 

[relistan]

For the case where development temperature is high, I tried developing at half strength (49 Borax soln + 1 PC-512 +50 water). Half strength in this case is not the same as 1:100 ( 99 Borax soln +1 PC-512 ).
An increase in development time of about 80% compared to that for normal PC-512 Borax was found to give a negative density closely matching.
On A3 inkjet prints the grain from both was not detectably different, and fine.
The half strength solution result gave the half strength solution as slightly sharper in this single test.
Above results were for FP4 type 517 cine film used in the test.

At 25 C the time for FP4+ is increased from 4m14s with PC-512 Borax to 7m 38s using the half strength solution.

Massive Dev Chart Film Development, Film Developing Database

www.digitaltruth.com

Very good info, thanks for running this test @Alan Johnson ! This might be a way forward for some films with quite short dev times at 20C as well.