Granulated white sugar, or refined pure cane sugar, is almost pure sucrose, with the other components of the cane juice removed. Using granulated white sugar is advantageous in any recipe delicate enough in flavor and color that you don’t want to shift the flavor profile or the color by using a darker sugar. White sugar does help achieve a look we often want in cookies, cakes, and pies—whether it’s a smooth surface, a slight translucence, or a slightly less cohesive crumb. When you don’t need the fuller acidity of the molasses in brown sugar, refined pure cane sugar is what you want. Caster or superfine sugar is a granulated white sugar with a consistency between confectioners’ sugar and regular granulated sugar. It dissolves quickly and is ideal for making custards and pastry creams.