Review of Sour Blue Raspberry Flavor-Cap:

Just another non present blue raspberry like every other companies attempt at blue raspberry! The problem is " there is none"!
I don't know these companies are so incapable of making this flavor, but they are, they just can't do it. 
When I'm thinking blue raspberry, I'm thinking of a blue raspberry sour patch kid, or a jolly rancher, an IN YOUR FACE blue raspberry! 
No flavor company has yet been able to mimic that flavor, and I mean not even close to it.
It just must be hard to add that heavy corn syrup flavor. 
There isn't one Blue Raspberry flavor out on the market worth a dam!
At wonder flavors you can pay to have them make you a custom flavor, I asked them for just such a " in your face blue raspberry" and they replied back, what your looking for can't be done, sorry.
The closest I've been able to get there was by using..
Pineapple INW 4©
Pineapple Golden CAP 1.5%
Banana HN 1.25%
Cherries INW .75%
Cherry MB .50%
Hibiscus CAP 1.25%
Cactus INW .50%
Blueberry HN .75%