Review of Sweet and Tart Flavor-TFA:

Im not sure why its called sweet & tart. In my opinion this is for the Sweet Tart, the candy. 

With no add'l flavoring, I mix it at 10%....at a 10,its not too strong nor too weak...just right. I have heard this will help with some fruit flavorings (assuming strawberry) to make the juice "pop" but havent tried that....yet.