About 9 or 9.1ml, it's more difficult to work out like that. Leaving you with 109ml. Might try working it out again later, doing this over breakfast! [emoji23]
Or replace 8.33ml of your 100ml with the 72mg nic and you'll get 6mg exactly. (leaving you with 100ml).
To be honest though measuring 8.33 that accurately isn't going to be straightforward is it? You'd have to move it all using 1ml syringes as they have markings to 0.01ml.
If it fits in the bottle just add 9ml of the nic and you'll get almost exactly 6mg.
Sounds good to me! Doesn't have to be a perfect 6mg either. I'll be halving the nicotine at some point too, and making a bottle of 3mg - I tend to mix the two at times.
Blimey!Trish,how much juice do you have in stock at the moment?It must be running into 1000's of ml's.
Too much is the simple answer

I've had two larger orders for the Vape Kitchen and Avant Garde (one no PG at all, the other vey little) because the former is in Hollywood and the other hasn't replenished online stocks yet and I bought it via the phone in case it takes a while to get it back online
All the others are new high VG ones with that 'must try' factor!
...and I always have 100ml bottles of Doughnut, Mint Choc Vapetto & LCCC plus a few others at 30 or 50ml from Chefs
8.33% was exactly what I got (6mg / 72mg * 100) to get percentage - you don't need charts Trish - just a bit of simple math.
8.5ml would probably be closer Adam and shouldn't be too hard to measure.
EDIT: Just realised what you have done there Adam, you are talking of adding to what is already 100ml which works out at 9.3
(100+1 +(6/72*100))
I'll check the bottle for space, but just adding the nicotine to the bottle as is was what I had in mind. If there's not enough space in the bottle, I'll remove a little, but 8.5ml sounds easy to do
I use this website:
Solution Dilution Calculator | Sigma-Aldrich
Or just a calculator/excel. I guessed at about 9ml (up from 8.33ml) and just set it to work out how much 72mg you'd need for 109ml and it looked about right.
Thanks - sounds easier than I'd thought it would be

I keep getting put off making 10ml bottles because of adding nicotine, and although I can get ready to use bottles of 6mg VG, I like the one CV has because it seems to agree with me best.