I bought nail polish remover back a few months ago from Sally Beauty, and I bought the one that just said "Acetone" rather than "Pure Acetone" - it looks slightly pinkish, and I believe it has a little bit of lanolin and such in it. And I expected it to work just fine, but really it didn't so much - not on difficult removal jobs, anyway. It seemed too diluted, I thought. So I went back to Sally Beauty today and bought the Pure Acetone, and I poured the two together. And it fixed it, to my satisfaction. It's still not as drying as pure acetone would be, hopefully, but it's also a lot stronger than the "impure" version. And I had enough partial bottles floating around that decanting from one bottle into another wasn't a problem at all.
The mixed version took three coats of Nfu Oh 51 off with very little trouble, where I had trouble getting two coats off with the other stuff.
I finally got around to trying Naughty & Nice, the Polished by KPT thermal, and well, not much happened. That's not really true, it got much lighter when I put it on, so it's reacting. But my nails are so short I barely got that "french mani" sort of effect that thermals normally have.
Here's a couple of pictures taken in the car, in a couple of different spots (meaning, a couple of different traffic lights!) so that the light is a little different.