I am probably wrong, but from what i have heard so far, purple coloured concentrated nicotine is all synthetic. Supposedly, only the yellow colored nicotine that haves "couple days warn socks" smell is really organic nicotine extracted from the plant. For example in EU nicotine that comes from Flavor Art haves slightly pink/purple colour, and couple people tokd me it's synthetic, not extracted from leaves. As i have said, i am unsure how truthfull is that, but i would say the chances are we are using synthetic nicotine for a while now without even being aware of it...
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The pink color is from a reaction that occurs when nicotine is kept in a nitrogen atmosphere.
From Carolina Xtractions FAQ:
CXTC mentions that different "push gases" have different affects on Nicotine. What "push gas" should we use?
1. 5.0 Argon- Argon does not seem to react with anything including nicotine. Argon is the preferred storage gas for all nicotine products, because it will not change any of the properties of Nicotine out to many years. Argon is quite expensive, as a push gas because it does not compress to liquid and commercially available Argon cylinders do not "pump" much product. If you need to store liquid nicotine for extended periods, argon is best. If you need to move nicotine, other gasses work just as well and go much further at much less cost.
2. Nitrogen-Nitrogen is interesting because it is a cost effective "push gas" with interesting side-reactions to nicotine. The primary long term reaction is that nitrogen will impart clarity to 100MG/ML nicotine, a positive, and with time will impart a pink hue, possibly a negative. The color change seems to occur mainly in the VG component of the solution, however CXTC has noted certain positive changes to the nicotine properties under long term exposure to nitrogen.
3. Food/Medical -Grade CO2- Long term exposure to CO2 will impart a "golden" tint to all brands of nicotine. CO2 is an excellent choice of push gas when the cylinder will be completely pushed out with twenty days as long as you keep that cylinder around 70F (room temperature) and release the tank pressure after each use. Beware! CO2 can carbonate the VG and PG in a 100MG nicotine solution, especially if store your tank at cold temperatures and under pressure.