Review of Sour Ball Candy Flavor-SC-WF:

I have been attempting to get Tart / Sour flavors to work for many years.  This has so far been the flavor with the most success.  I recommend that you do NoT use it alone, because it’s not very good by itself.  But if you add 1.25% to 2.25% to a mix that needs a boost in tartness, you might be surprised!  Gets as close to “sour” as any flavor out there.