Grabbed a new vial of test out of my gear bag today and noticed when I tipped the vial on it's side, the movement of liquid made swirling type pattens that almost seemed to move in slow motion and then changed direction as I put the vial upright. Kind of like if the oil had separated from the alcohol. Shook it up and dropped it in warm water and the issue went away. Has anyone else ever seen this before? Is separation all this is?