TFA Sour Question

[Fenario]

Just got TFA's Sour with my order today and would like suggestions on a starting point for adding to my flavors. I'm guessing it would be drops, but lets say in 10ml of one of my DIY flavors. Thanks everyone, these forums have been a great help.

 

[Dave_in_OK]

I use it at 1 drop per 5ml test and then adjust.

 

[Fenario]

I use it at 1 drop per 5ml test and then adjust.

Thank you very much. Needed a start point