Correct, but I keep some of my nic at full strength in case there is something that needs more nic but otherwise I want to change a little as possible. I do dilute my normal use to 33 mg because I think I can feel it just breathing around that open 100 mg bottle, good call on diluting some, but I store the rest undiluted in the freezer. You must have a lot more PG and VG.
100 mg nic is easy, use x % and you get x mg/ml. I just do the mixes in my head or on paper, but I'd say if you are questioning your math, yeah should use one of those juice calculator programs... although I can understand wanting to be more careful with the nic.
I've heard that the higher the Nic, the faster the nic will turn bad. I heard that a higher concentration of nic will go bad faster If I quote from Nude Nicotine's website:
e-liquid-chemistry-education/" data-source="" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch">http://www.nudenicotine.com/category/e-liquid-chemistry-education/ said:Few last points to cover – shelf-life varies largely by nicotine strength, as well as PG/VG ratio. Higher nicotine strengths will possess more nicotine molecules, less likely to be completely solvated by their carrier (PG/VG). Put simply – 100mg/mL formulations will keep for less time than a 24mg/mL formulation. PG is also a much better solvent for this purpose – it has an extremely low viscosity, will dissipate dispersed oxygen bubbles quickly (say that 4 times fast!), and has a longer shelf-life chemically (2 years from DOM, vs. VG – 1 year). Thus some may only see a short shelf-life for a 100mg/mL solution kept on a shelf compared to a 24mg/mL solution kept in multiple frozen aliquots. Remember, nicotine solution solvated in wither PG or VG WILL NOT FREEZE!
Unfortunately, I have an 8 yr old, and a non Lockable freezer, so I can't realistically freeze my nicotine yet and be safe. I would imagine that diluting it first would be the best way to keep it longer. Just a thought.