As you recall I had issues with MFS nicotine when they switched to alchem, and recently they've switched back to their old supplier.
I got a 1L bottle of the new batch this week. The solution is very clear with a slight tint only noticeable in a clear glass bottle against a white background, side by side with something clear (VG, PG, etc).
The nasty alchem burnt rubber kerosene odor is no where to be found thankfully. It smells just like MFS used to smell to me, somewhat 'basic' or 'alkaline' and earthy with kind of a caramel thing. Entirely pleasant.
I mixed some down and am vaping it, and I feel its confirmed, MFS has gone back to their old good stuff, and I hope they're sticking with it. I won't repeat what I've said about MFS 'flavor profile' as you can dig it up in this thread, but basically unflavored this has a killing throat hit, burn and kick. This is much cleaner tasting than the 2011 MFS that I have, just like what I was sent last summer in a 'blind test' (MFS vs. Nude) from an ECF user. At 6 mg and 28 watts I can barely taste it, but it very 'full-bodied' for lack of a better term. I love this nicotine, and happy that MFS has returned to their roots.
Thanks TaylorMade!