I was given 10 30ml bottles of newly purchased 0% e-juice from a friend. What would be the formula to add 100 strength nicotine to have it a 6% nicotine mix, if it is possible?
Thank you.
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Don’t worry about the PG/VG ratio… just look at the Nicotine line.
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The ELR juice calculator website is a great resource for mixers. If you familiarize yourself with how it works, it will be a valuable tool for you in the future. 
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Yup, just subtract the 1.8ml from your 30ml for your 0mg liquid, then add the 1.8ml nic base.
(or use grams if you use a scale)
so
28.2ml of your 0mg liquid
1.8ml nic base
will give you exactly 6mg nic in your final product
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Yup… 
@anon28032772 has correctly offered the finer points of “how-to” with your project, but, I think you figured out the gist of things on your own. Soon, you’ll have 350 flavors in your stash, like the rest of the “rabbit hole” people around here, and you’ll be mixing up a storm! 
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And you’ll still be cussing because every other recipe that you want to make has a flavor or 2 that you still don’t have
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Thank you all for all the advice.
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