Review of Sour Flavor-TFA:

I use this in my blue razz recipe and it adds the extra sour tone not found in Blueberry Candy on it's own. It also is great if you want to keep the percentages down. What was a much higher percentage of Blueberry candy was cut by more than half by using this sour. 2% in a mix gives pretty good sour taste. Have not tried this one alone.