I am not 100% sure, to be honest. It was mentioned somewhere here in ECF, and I happened to pick up on it because I was knew about NicVape. At issue is not China vs India. At issue is the method the nicotine is produced with. Evidently extraction, actually many extractions and "flips" gets nic with some residual alkaloids. These are allowed below a particular level, including with pharma grade nic. And most of the nics used by us are pharma grade, or even better. And in general, they still have a taste when vaping unflavored. Some like it, some don't. Never tried XtremeVaping, but until Ice came along, every nic I had had its own taste. Ice changed that, and it was not expensive. No taste at all, and virtually no odor. Never had anything like it. So Cyrus and I got into a discussion about what it is that gives the taste. Ice changed what I thought I knew about nic, and nic like this has probably changed what e-liquid manufacturers thought they knew about what makes a good, high purity nic. I recall a conversation with one vendor that mixes from free-base, and he also thought that nic SHOULD have that bite and a tight sharp odor, and some pepper, like BE, RTS, ECX, etc. And that is the case for pharma grade. But not Ice...so how do they do it??
For Ice I don't know for sure, but after seeing NicVape's specs, and we all sort of just scratched our heads about them, and knowing the source and HOW they do it (distillation over hydrogen gas at reduced pressure, after the final extraction/flip), suddenly it made sense. You cannot get nic like this from extraction alone, you have to distill the final extracted nicotine in a very specialized way. This method I am sure is well known, but not all plants are geared up for it, and why should they be when pharma grade does not require this to meet standards?
But while this source company is probably also producing pharma grade nic, they want to produce nic especially for vaping...nic that has no taste or odor at normal concentrations. This is what they are primarily dedicated to. As I said, their methods are not a secret, and I'm sure we will see nic like this coming out of China soon too, if it is not here already. I am just familiar with this Indian company right now doing it. I suspect that all "invisible" nics are produced in a similar way. This may also be the case with Xtremevaping.