Hi guys, I recently processed a test strip of Kodak B&W 16mm Tri-X 7266 and it keeps coming out clear after I take it out for re exposure! Clear, as in, no indicating marks what so ever. Completely blank. I'm using D19 + Potassium Thiocynate for the 1st developer and permanganate bleach for the bleach bath. Am I over or under developing? The tank is light tight and nothing is wrong with the camera or exposed roll.