What is causing this darker color of my juice at bottom of carto-tank?

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Baditude

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I can't be certain and I'm just conjecturing here. Some juices have tiny particulate matter suspended in it. This stuff does not get vaporized, but gets left behind and accumulates in the tank. You may not be able to see these particles with the naked eye, but my bet is if you could observe it under a microscope you could see the particles in suspension.

This is the reason I believe certain juices like Boba's Bounty is so hard to wick in cartotanks and clearo tanks. Boba's has a very high particulate particle count in addition to being a very thick vg juice. You can put multiple holes in the carto but the carto will still stop working soon because the particulate matter clogs the filler material and keeping the liquid from getting to the atomizer.

I only base this partly on my observation and hypothesis, I can't prove it. But it makes sense to me. ;)
 

DaveP

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Who knows? Maybe the heat at the bottom of the carto is causing the juice to change color a bit. If you tilt the tank to mix the juice does it clear up and then go back to dark? Could there be an optical aberration at the bottom of the tube that makes it look dark? Is the juice optically taking on the color of the bottom of the tank due to reflection of the cap?

What happens if you put some juice in a clear tube and just let it sit for a day?
 

SupplyDaddy

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It could be some burnt juice from inside the carto.
And think about this..
The carto get hot from the coils, the juice in the tank is going to react to the heat on the outside of the tube also, which can cause thickening and/or a color change of the juice.

Either way, unless it's affecting the flavor, swish your tank around and vape on..
 

Dougiestyle

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Sunlight affects nicotine. Believe it or not, e-liquid "tans". The majority of the issue is the contact between "simmered" juice inside the carto with fresh juice outside the carto/inside the tank. Some of your internal, previously-heated but unvaporized liquid is coming out of the wicking holes.

It's purely visual. It can affect flavor, but until your carto is ready for replacement or flavor is negatively affected, you should be fine.
 

adeline

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I always figured it was coil gunk.

If you've dealt with RBAs (or heck, even clearos) you know that your coil accumulates black gunk and gets pretty gross after a while.

With a carto sitting in a tank, the coil is in constant contact with your juice, which is pretty free-flowing. The darker juice around the coil comes out through the holes in your carto and settles near the bottom of your tank since it's heavier with that gunk.

Same thing happens in a vivi nova. Same thing happens in my genny-style.

I could be wrong, but I feel so right. :p
 

Schnarph

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Similar experience here, but in a top coil clearo. Not all juices have the same effect, but after 6ml of some kinds of juice, I am left with a half ml of much darker stuff that is getting close to opaque. I can dump the stuff, clean the tank part and the coil/wick unit, and all is well. My coils and wicks are still fine for a repeat, but it does seriously shorten their lifespan. I have been keeping all this dark juice hoping I might be able to filter it. As an experiment, I put some in an carto I had already cleaned a couple of times and didn't care if I wasted, and it did vape. It didn't taste burnt, but it didn't make much vapor and also barely wicked through the filler material. I have no need to look at this junk through a microscope, it's obviously changed for the worse. Since only certain juices do this, it would be nice to know if a higher or lower resistance coil might do a better job on these problem juices. I would do this experiment myself, but I finally finished off the last of my problematic juices, and won't be ordering anymore of them, for obvious reasons.

Anybody know if there is any hope for this liquid? I suppose a centrifuge might do the job, but it might also separate the PG, VG, flavor, and nicotine. Like most people, I don't have access to a centrifuge, and I wouldn't go through all that trouble, anyways. It sucks when you like a juice but it kills your cartos or coils extra fast. Sometimes, when a thing won't work, you just can't fix it.
 
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