Hey everyone. It's been quite awhile since I've been here. Here's what I have. I have two bottles of hand made e-liquid , 100ml each. Both are 12mg nic. I need to bump up the nic level to 30mg for each bottle. I have a bottle of 100mg base to use. How much ,or how many ML of the 100mg base , do I need to add to the 12mg bottles , to change it to 30mg..Thanks in Advance...