Brown sugar is a sucrose sugar product with a distinctive brown color due to the presence of molasses. It is either an unrefined or partially refined soft sugar consisting of sugar crystals with some residual molasses content (natural brown sugar).
The white stuff we know as sugar is sucrose, a molecule composed of carbon, hydrogen and oxygen. Like all compounds made from these three elements, sugar is a carbohydrate. It’s found naturally in most plants, but especially in sugarcane and sugar beets—hence their names.
Icing sugar is a fine, powdered form of white sugar. Its texture is ideal for making icing and buttercreams as it dissolves quickly and easily and does not really require the application of heat.