Hello there! I am currently in the process of getting my school's darkroom back up and running. Just did a few test prints today and while washing i noticed I had scratched a few pretty badly. So I took it out and sure enough I could scratch A LOT of the print right off the paper. Now, I am 100% new to the chemical part of darkroom use so I'm going to assume it's a problem with my mixing. Would this be a safe assumption or could it be something else that went wrong?