See msg 37408.
Non-centifugal raw sugars still contain residual molasses and have a
sugar content of around 90%(see msg.37412). They are convenient to use
in making rum as they can be regarded as a dried sugarcane juice. You
can make a substitute using white sugar and blackstrap (from Dutch
'stroop' = syrup) molasses (50% sugar content). By using the Pearson
Square (see msg. 4986) we find that to make a 90% sugar content raw
sugar we need to add 250 g of blackstrap molasses to each kilogram of
white table sugar (1:4 ratio).
To make a 10%abv rum wash, we need 700 g white sugar & 175 g of
blackstrap molasses/4l water. (Based on the fact that 17 g of sugar/l