I had that problem with clearomizers also. I was told it has to do with the wicking absorbing more of the pg or the vg (I forget which one), which made the juice thicker and burn more hot. after that it started tasting burnt. That was one of the reasons i switched away from them.
wow!!..............
I agree. I know pictures can be deceiving, and my juice darkens, but that looks very dark and a greater change than ive seen yet.
This is how dark my juice gets at the bottom of the tank, the bottle on the left is what it started off as:
http://imgur.com/9IUK6.jpg[/im g][/QUOTE]
holy crap.
Not a big deal. It's normal, especially with top coil type devices, such as CE2s, Vivi Novas, Genesis, etc. It's just excess juice which has been heated by the coil and caramelized, leeching it's way back down into the tank.