Icing sugar is a blend of fine, powdered sugar and an anti-caking agent, typically corn starch, though wheat flour and calcium phosphate may be used. It is most commonly used in baking.
Corn and wheat are common allergens; wheat is of concern to gluten-intolerant and celiac individuals. Seek icing sugars using alternative starches if these are concerns.
Icing, frosting, cake decorations, pastries, cookies, cakes
See: sugar, white; corn starch
Powdered sugar, confectioner’s sugar