I'm brand new to the home-developing game. I purchased the unicolor c41 developing kit and have developed 3 rolls of color film successfully so far. However, tonight I developed a roll of Kodak 400 color film and it came out very dark. I can barely make out images on the negatives (and can't read the film info on the margins). I'm assuming this means it overdeveloped; however I don't know why. I followed all procedural instructions and my temps were right on - 102 for dev and 98 for blix.