I followed an STB tek, after two successful pulls, I go to draw the naphtha a third time this morning, and it is all uniformly black and gooey, no separate layer of naphtha on top like there's supposed to be. I suspect this might have possibly happened because I lessened the amount of naphtha each time (a little spilled once, the other time a little was left in the evap jar and just evaped), so maybe I offset the ratio, though I'm not really sure. How can I rectify this? Do I dump everything out all together and restart or do I just add a little naphtha to see if it helps after 24hrs and is separate again?