Usually, neither white nor brown sugar is sifted before measuring. White sugar, however, if it is at all lumpy (confectioners sugar frequently is) should be sifted first, spooned into a dry measure, and leveled off with the edge of a spatula or knife. Brown sugar, on the other hand, must be packed into the cup so firmly as to keep the shape of the cup when it is turned out. If brown sugar is lumpy, it can be rolled or sifted before measuring. Free-flowing brown sugar is poured into a cup or fractional cup and leveled.