I have a 6 gallon +1 gallon batch of Blackberry that is done and just sitting there staring at me. I decided that I wanted to play a bit with the one gallon so I went to my local supply shop and asked what they recommend for fortifying a wine. I was handed a bottle of a clear brandy and he explained that this is what they recommend if you don't want to change the flavor just fortify it. They did have a blackberry brandy but he said that would change the wine flavor and if I was happy with the way it tasted this clear stuff was the way to go. So my question is, what kind of ratio is generally used to fortify a wine? I know a lot is to taste and that will be my main guide. I am just wondering if there is a starting point. The brandy I bought is a 750mL bottle.