First we must look at a fruit chart to determine the sugar conversion:
fruit Chart
Taking blackberries from the fruit chart and using the following formula posted years ago by Dnderhead we can calculate our amounts for our recipe.
Postby Dnderhead » Thu Sep 22, 2011 11:20 pm
i guess your making 3 gal? if you look, blackberries are 8% sugar.a gal must be 10lb?
so if you used 3 gal. of berries 3x10=30 x.08=2.4 lb sugar.(in berries)
now each lb of sugar per gallon=7% so if you have 3lb in 3 gallons -2.4(for berries) =1.6 lb(sugar needed to make)=7% wash.then if you want add another 1/2 lb per gal.10.5%
so 3 lb of sugar brings you very close to 10% wash.i whould not go over this.
some wine nutrients whould help insure fermentation.
if you ferment on skins you will have more flavor.