With the finaplix that actually arrived (instead of teset Estridol) I batched up some Fina. I thought everything was going well. I preloaded some syringes with the Fina and when I checked them today (it had been about a week) they were stained brown around the area where the needle meets the syringe. Is this normal..should I shit can the Fina and make some more..or is it safe to use, despite its discoloring qualities.