I had some 'sterile' vials laying around and decided to transfer some test into them. I realized about 8 ml's in that there were a few black specs stuck to the inside of the glass. I tried to remove the test to put into another vial but one of the specs broke free and got mixed in. So needless to say it's good as garbage because I have no idea wtf that black spec is. After I emptied the bottle I took a needle and poked one of the specs, it was hard and almost fused to the inner wall. Anyone know what these black specs could be?