I need to push develop hp5 at 1600 with Clayton F60 developer. I can;t find any info on converting the time. I know that normally you adjust development for 15 seconds per degree above and below 68 but on their charts they show a dev time for hp5 at 400 of 7 minutes at 68 degrees and 6 minutes at 75 degrees, which is less of a drop in time than convention would suggest. Thus I am leery of using any of the normal conventions for push processing such as add 30 percent per stop or multiply the dev time by the square root of two. any help will be greatly appreciated.

-- Fred Turko (fturko@sprintpcs.com), May 27, 2002

Answers

I called the Clayton company (website: http://www.claytonchem.com) and the guy said that the time should be 9.5 minutes for HP5 pushed to 1600 based on his chart. This is using 1+9 dilution ratio. So I did the math to see if the 15% rule applied and it pretty much did... using the time for 68 degrees (7 min) x 30% = 9.3, which is fairly close. So there you go. Hope this helps.

-- Jen O (jenoy2001@yahoo.com), November 26, 2002.