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  1. Kurt

    Nicotine Comparisons

    COAs are good to post, but COAs for each batch of nic are generally not posted, and nics can change subtly from batch to batch and have virtually the same COAs. I believe it is the spectrum of TRACE components (nic-oxides, alkaloids, etc) that dictates the taste of a nic, or the lack thereof...
  2. Kurt

    Nic handling/storing 101

    Not had cracking, but I wouldn't doubt it. A large glass bottle holds a large amount of liquid, which will expand more mL than a small amount. And a large bottle tends to be a bit more fragile than a smaller bottle. Of course you should keep the bottles upright, since the air bubble from...
  3. Kurt

    Nic handling/storing 101

    I filled to the rim bottles in my chilly 60 F kitchen in the winter, and brought a bottle out into my 90+ F office in the summer. It leaked 100 mg VG all over the outside, from under the cap. Also some people warm their bottles of VG-nic to syringe dispense easier. If you want to fill to the...
  4. Kurt

    Nic handling/storing 101

    My Long Term Nic Storage sticky should answer many of your questions. Long Term Nic Storage Glass + a few mL headspace + freezer = as good as it gets. It will last years, no doubt. Worrying about the O2 in a few mL headspace is not warranted. Expansion, not from freezing but from warming...
  5. Kurt

    Dr. Farsalinos on e-cig safety & toxicology

    Thanks for posting this video!! Everyone should see this, but if you watch it from YouTube there will also be a lot of other great talks from the Global Forum on Nicotine conference given too. Hearing the supportive talks from public health people from the UK is painful, since the UK is taking...
  6. Kurt

    Nicotine Comparisons

    Slight pink or peach color is not uncommon and not considered a problem. I would not worry about it. Its just trace nic oxidation products, which are not harmful, and often add nice character to a nic. The "pepper" term was originally meant to describe the nasal tingle or burn that some...
  7. Kurt

    200 mg Base Question

    I would agree with this, or at least extremely skilled with 100 mg/mL and have all the safety requirements, and use them. 200 mg/mL is more than I am comfortable with, although I have worked with 300 mg/mL. You will need good ventilation. The fumes can give you a serious buzz. Bad on the...
  8. Kurt

    Nicotine Comparisons

    5Pawns did use PDO for a while. It is where I first heard of PDO. Here is a company selling PDO/VG base liquids, with and without nic, up to 100 mg. Samples are available. Shop Now Evan Serling is the owner, and a good guy. They also sell Real Flavors. I tried their Vapor Base, which is...
  9. Kurt

    Nicotine Comparisons

    This. Realize that DIY will be messy in the beginning. You will most likely get DIY nic on you. Get a sample of 36-48 mg/mL nic to try out. It will probably be 120 mL which is still a fair amount, and enough to figure out what you will need. I use syringes for everything and glass bottles...
  10. Kurt

    Nicotine Comparisons

    Yeah, PDO, while it works very well and does not dry me out like PG, I don't like the taste. I don't know about finding another e-liquid carrier. The problem is these compounds (PG, VG, PDO) are well known to be relatively benign with inhalation, and there would need to be serious and...
  11. Kurt

    Nicotine Comparisons

    I've been doing post-graduate chemistry for 35 years, and trust me, I have learned an enormous amount since I started vaping, and especially since I first published in this field. Most of this chemistry is brand new to even the most seasoned of chemists. Exciting, frustrating, and very...
  12. Kurt

    Cutting 100mg Nic in half to 50mg, then storing. Good or Bad?

    Probably, and the thicker the better. But its hard to say since there is little multi-year data on room temp storage. I think Danny is right, depending on ambient temps, you could get several months without noticing a difference, and a bit of oxidation may or may not be a problem for you. I...
  13. Kurt

    Nicotine Comparisons

    I have never correlated viscosity with density. Nor have I heard of that correlation. This link states there is no such correlation: Is there a relationship between viscosity and density? "There is no relationship between the viscosity and density of a fluid. While viscosity is the thickness...
  14. Kurt

    Nicotine Comparisons

    I recall there were some complaints with MFS from 2010, this being one, plus hot spots in a couple batches of VG-nic. Reported all fixed, but I found myself avoiding vaping it, and never bought from them again. At that point, Box Elder was the nic to have and had the best price: $80 for 1/2...
  15. Kurt

    Nicotine Comparisons

    AZPlumber: I don't know about current MFS. My only MFS nic is from January 2010, and it has a solvent off-taste to me that I cannot stomach or hide. Have not bought MFS since. Cool_Breeze: As far as water content of the RTS VG-nic, based on general flow of it I would say 5%. Still much...
  16. Kurt

    Nicotine Comparisons

    No offense, but you clearly don't know. This is not correct chemistry at all. Please don't make up chemistry if you don't understand it. Chemistry debates over real issues about storage details are hard enough. It is O2 that reacts with nic, not the "extra oxygen molecule" that VG has...
  17. Kurt

    Cutting 100mg Nic in half to 50mg, then storing. Good or Bad?

    You know what? You make a very good point! The O2 diffusion rate through the bottle can compete with the oxidation rate. So its a bit more complicated than what I said previously, AND I did not consider something else: that for my scenario to show constant % of nic being oxidized between the...
  18. Kurt

    Cutting 100mg Nic in half to 50mg, then storing. Good or Bad?

    In principle, it wouldn't, but this assumes the temperature you filled the storage bottles is the same as the temperature you bring them out to. I once filled to the brim in a kitchen in January (about 60 F in the kitchen), then brought a bottle into my office without AC in about 100F heat of...
  19. Kurt

    Cutting 100mg Nic in half to 50mg, then storing. Good or Bad?

    No worries. But cracking is not generally the issue, rather leaking from under the cap, at least in my experience. Never had a crack or break. My caps with euro inserts as gaskets are still not tight enough to allow a lot of pressure buildup inside the glass bottle. And expansion is from...
  20. Kurt

    Cutting 100mg Nic in half to 50mg, then storing. Good or Bad?

    @IDJoel: no problem at all. @VNeil Did I once say 1/4 inch headspace?? That is very small. For 50 mL Boston rounds, I fill to 1/2 the way where the bottle starts to taper in, which is about ~5 mL headspace. I don't dilute before storing, but this would be enough to shake-mix if you wanted...
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