Standard developement time for Tri-X in straight D-76 is 8 min at 68 degrees, or if diluted 1:1 10 min. at 68 deg. You should get acceptable results if you increase developement time by about 40 percent but expect some increase in grain. You can cure any remaining density problems in the negs in the printing process by using filters with polycontrast paper.(posted 9180 days ago)