Molasses: The filtered residue of sugar refinement after the cyrstalized portion has been removed. "Light molasses" is roughly 90% sugar, while "blackstrap molasses" is only 50% sugar and 50% refinement residue. It may have sulfur compounds added to sterilize and stabilize it. This makes it generally undesirable as a sugar for wine, as it could encourage the formation of hydrogen sulfide. It is similar to treacle.