hard to say. when u make high concentrayions, you have to have a higher level of BA (definietly). and high BA hurts. and the addition of BB (advisable) may lessen the total amount of BA used. regardless. when homebrewing, it's not the potency you should be worried about, it's the solution crashing (crystalizing).
i've hered of 500mg/ml lines out there, but they probably use a fair amount of BA and BB. it's definitely at a higher concentration of the BA and BB than let's say 200-250mg/ml.
if a powder weighs a gram, estimate it to about 1 ml. so if you want a total 10ml solution and use 2gm powder, you'll use about 8ml total of the sterile oil and alcohol.
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