Mr.Mann posted this in the E-juice forum under shake, shake, shake your juices. I think it might clear a few things up.
Hey all, I think you should read this! Especially those of us that want to vape NETs (naturally extracted tobaccos), or for those of us who inquire about steeping. Donley from Want2Vape contacted me and wrote this in an email ...
To shake or not to shake, that is a good question.
Pros and cons to this, as with most things in life. And life (shelf that is) is the decision factor.
Many eliquids are created from dry based food grade flavorings which in high concentrations can precipitate back out of solution. Especially when mixed with a strong base like nicotine.
Other liquids which are created from extraction like our coffee , espresso and tobaccos, contain high levels of solids as well but are in suspension.
Which can never fully be removed through filtration (we high vac /press filter to less than 1 micron resulting in a total solids of <30ppm ).
So if a eliquid that is made in these manners, time can cause a them to have a layer of solids or a heavier specific gravity graduation to occur
And thusly need to be shaken to remix. (not necessarily recombine back into a solution) (that takes a bit of heat and long periods in a mixing environment like a heated magnetic lab mixer)
But, if you shake them you then cause the precipitant to be inter dispersed and when you fill a arty, cart or carto you now have these solids sticking to your coil. A good dose of Atty refresher helps flush these away between fillings/flavor changes (shameless plug, sorry)
Personally, decanting is the better method here in that situation. Leaving any solids behind and transfer to a new clean bottle.
But this is for juice that is previously aged.
For new fresh juices, a good mix n shake is a good idea even though the postman did a pretty good job already.
Also many believe that a fresh juice needs steeping. This truly has more to do with nicotine concentration than the flavor package. Nicotine creates a nitrogen Bond with the pg /vg/flavors that over the first few days tries to create a molecular equilibrium (which we all call steeping) and you notice that some start to change color. Especially any with vanalin . So high nic levels need more shaking and steep time.
This has been posted with the expressed written consent of Donley W. from Want2Vape
Thanks Donley!