FAIK, most of the discussion these days is about appearance and taste. People want absolutely clear stuff that doesn't taste like tobacco.
If that is your goal, I'd say use synthetic nic or maybe nic salts. Both are pricey and I've not tried them.
Back in the day, when we vaped 18mg+ and it was mostly tobacco and other strong flavors, it wasn't such a concern.
I still vape 14mg and still mostly tobaccos, some fruity stuff, with only a few 'dessert' types that might be more affected by a strong-tasting nic.
Found some of the ancient threads. Kurt is the guy I'd mentioned, a chemist by trade.
This post in particular. Unfortunately, I think his main posting may have been moved or gone.
I could care less if it's not clear as long as it don't stink like fish and it gives me a buzz. ;-)