Ok, well I agree with what your saying and I use paints and shadesticks as bases, but I think you might have misunderstood the question.
I meant that I get blue lines from the electric eel on the color that I use in my crease, like overtop that color. For example, if I use Golden Olive pigment all over my lid and into the crease and use Electric Eel e/s as a liner, little blue marks will show up around the crease area.