I have a few prints that I want to tone with a ploysulfide homemade toner. Post-treatment calls for time in a hardener bath. I don't have the chemicals to make a hardener bath right now, and I would like to treat the prints before I got the ingredients. I do have lots of Kodak Rapid fixer that has a hardener in it. Would it be okay to fix the treated prints in that instead? Of course I would have to wash>hypo clear>wash the prints again after.