Nicvape doesn't use nicselect for some time now and i'm pretty sure they use chemnovatic, based on the expiry-date which for chemnovatic is always two years except a day. They post 3'rd party COAs which show hexane to be under detection-limit of 0.01%. Many COAs often don't mention hexane or whatever extraction-solvent otherwise used, just related alkaloids and water as only impurities, which is annoying to me.
I'm gonna do a new round off unflavored testings of new batches from chemnovatic, nicselect and nicobrand, the usual EU suspects from most EU vendors. I'm doing it yet again because i've just switched to single-coil builds at low wattage(25W) and higher nic(9mg), which makes it much, much easier to find differences in the nics. Before I was to lazy to rebuild for the testings and only had mechs and 0.1ohm RDAs around, so could only take like max 1 sec draws and not many before getting dizzy/nic-sick. I'm still on the quest for finding the best nic for me to stock up with.
My normally used UK-made nic, nicobrand, has now a slight spicy hot-pepper taste as backnote, not detected before by me at lower nic and higher wattage, hence my will for new round of observations.
Should be interesting to hear your results with higher nic levels.