Hello all, Simple stupid question. Do the 5 liter containers of Ilford Rapid Fixer have a seal on the opening? I thought I remembered them having it, but the container I just received had no seal and some of the fixer has leaked out. I'm wondering if it's usable or if it might be shot..... And if there should have been a seal, I guess I go to the company I ordered it from and to Ilford directly with the batch number. Like I said, simple stupid question, but I just can't remember for certain about a seal on my last container. Thanks so much!!