I make one gallon batches and pitch 1/2 vial of White Labs each time. I poured 1/2 vial into a sterilized (with Iodophor) mason jar and I am going to pitch in about 30 minutes. I just picked up the mason jar and noticed a black speck in the slurry. Should I pitch this yeast or toss it? are there ever specks in these vials?