grape tannin for blueberry fruit puree

[WildSeedGrrrl]

Ok, hopefully this will not sound like a silly question.
I'm going to be using Oregon Fruit Purees but I don't have any grape tannin at the moment. Do i need to add grape tannin to my blueberry fruit puree?
wsg

 

[Wade E]

I think Blueberry has enough bodt but if you dont thnk so you can always add this at a later date like post fermentation.