I don't see anything....but I will tell you that I used those sticks like in the top photo, and the line was VERY faint, and never got darker. it was just either completely blank, or the faint line... these are what my positives looked like the same day I got this: so, quality is def something to keep in mind between the two tests. if you see a BFL, it may not get darker, but it's probably positive. good luck!