The only one of my purchases that ever became discolored was the Armor line of nude nicotine. Make sure what you get is in glass. I mean the weird thing is, it wasn't frozen that long at all (I was between bottle colors) and it discolored visibly. The first liter I decanted into glass was excellent.
If you plan on continuing
vaping unless you have a very, intensely discerning and sensitive palate and want something that looks and tastes like, IDK Evian, l would say Headland.
Why? It's inexpensive so unless you want to pay a lot more to buy Armor in glass, which may or may not be worth the convenience, it's pretty steady. I started out with River supply and spent a fair amount. I was using nic salts at the time but I was also stocking for my life time and it got prohibitively expensive. I like Heartlands nic. It can have a slight peppery smell to it and a a HINT of a peppery taste.; That hasn't really bothered me. I like the taste of tobacco, why would I hate a hint in my vape.
But they are doing what they do best, putting out good serviceable nicotine time after time. I have never had a single issue with an order and that can count for a lot. I have also had Heartland's nic in my freezer for longer than the NN Armor vape that discolored quickly without a hint of discoloration, also in plastic.
With that said, it could be the exact OPPOSITE of what you want. I have also heard good things about Wizard labs.
Best of luck in your quest,
Anna