I just started DIY with juice a couple of weeks ago. I did MUCH reading here on the forums before making my first attempt, including reading the entire "nicotine comparisons" thread before even buying my nicotine.
I am stocking up before 8/8 so I bought 10 liters of nicotine from two different vendors that were recommended here on the forums. It took me about a week to rebottle everything into the amber Boston round bottles.
The rest of my comments on this will go to show that everyone has personal tastes so no-one can fully recommend what others should do.
I bought 8 liters from one vendor and bottled those first. They were in 100% vg and looked very clear in color and only had a very slight odor to them. I thought, this is great, I bought the good stuff ! Then I bottled the 2 liters from the other vendor's nicotine (less recommended vendor) and was disappointed to find that their's was quite pink, I was expecting maybe light brown, but not pink and it had more of a robust scent to it. I was a little bummed by this after all that I have read here.
So I decide to use the pink stuff up first since it didnt appear as fresh as my other 8 liters.
It was difficult waiting for it to steep because I was eager to try my own stuff. I helped it a long a bit with a warm bath and only waited 1 week to try it.
And now I know what is meant by "peppery" taste. There is no mistaking it. But I LOVE that peppery taste so now I wish I had bought all 10 liters from the second vendor LOL.
Just goes to show ......
Slight pink or peach color is not uncommon and not considered a problem. I would not worry about it. Its just trace nic oxidation products, which are not harmful, and often add nice character to a nic.
The "pepper" term was originally meant to describe the nasal tingle or burn that some nics give, rather than the taste of pepper, like black pepper. Both are possible, of course, but that is what is generally meant by pepper. VT Throat-Hit was originally called Pepper Nic, due the nasal tingle that the added oxidation gave. Generally the more deep the color is, the more pepper it will have. I am a fan of pepper, since it helps to tell me how much nic I'm getting, and it adds to the satisfaction.
Most nic is shipped in PET bottles, being safer and lighter than glass during shipment. PET is better at keeping O2 out than polyethylene plastic, but it can leach plasticizers over time into the nic, causing a plastic taste as well as health concerns, so getting it into glass ASAP is best for storage.
10 L is a lot! I bet getting it all into glass and storage was quite a satisfying experience!
Fact: if you just let some nic sit out for a while in LDPE bottles (normal dropper bottles), as it gets colored it will gain pepper, TH and possible a slight tobacco-like taste (although not always). So that nic that you think now is too "invisible" can definitely be improved! This can take months, however, especially VG-nic. But when it gets to where you like it, you can freeze it in glass and keep it like that forever. Been doing this for a few years, with excellent results. I like that completely invisible nic is available, since it is ultra-pure, but I personally find it boring and without that sensory feedback, I tend to vape too much nic.
Always best to get 120 mL samples of any nic you are considering buying in bulk. But too little character with time can be fixed. Too much of the wrong character, as is the case with some of the rougher nics, cannot be fixed.