The flavor I had in was a vanilla wafer, but the liquid was clear until the store vender added 6 mg of nt. then it was a very light yellow. Hopefully I'll be making my own soon so I know what's in it. I've purchased some juice that said it was 50/50 and was thinner than 80pg. It all depends where I buy the juice. It must be juice because if I put it over 4v it tastes burnt. Happened with a cloves anise type before this one. That said 50/50 and was a dark orange but thin as water almostIf the wire is turning black, there is something in the juice that is building up on the coils. I have a couple flavors that just destroy my heads after as little as a single 5ml tank full. What is the actual flavor? Dark juices do it for sure, but also juices with honey, some sweeteners do it too. You might also consider pumping up the power. I've found that nautilus coils (and the BDC cousins) tend to foul easily when run under 4v.