BA is Benzly Alcohol. It's used to sterilize the powders. Most gear now adays is 5% BA or lower. No real need for the higher BA concentration. USP24 is the type of powder I beleive. I'm not sure on that. Someone will chim in here and help with that one i'm sure. No problems with the higher BA except painfull injections but you want to try and keep it at 5% or less. I know if you plan on making your own and depending on what your making you can make it with 2-3% ba and 10-15% BB. BB is Benzly Benzonate(sp?) It is used to help thing out the oil for injection. I'm sure somone else will chim in with a more clear answer for you.
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