Making fruit beers from extract?

[Reg]

I've been toying with the idea of making a fruit beer from some time, but don't want to waste good ingredients on it as anything would be a total experiment.

My plan has been to replace some extract with the juice of say blackberries as they are abundant and free right now but I'm a little stumped as to how to calculate the amount required to replace malt extract as what I feel I will be dealing with is fruit juice at a "wort-style" concentration...

Then there is the amount of malt to replace full stop???

Any opinions? :blink:

[Jim]

I've no experience of this, but I would think the best idea is to make up your fruit juice first, then measure the specific gravity. From there, you can calculate how much malt to use to get the final strenght you want.