Powdered sugar is obtained from white sugar by a special process, so it is the same as white sugar. However, they may not be interchangeable. Sugar can be used as a decoration for pastries, but white sugar cannot. It depends on the specific function, if it is just flavoring, you can use them instead of each other. You can buy it in general pastry stores in Changzhou.

Powdered sugar is very fine grained, with about 3-10% starch mixture (usually cornstarch