bleached flour

Bleached flour is wheat flour that has been chemically treated with oxidizing agents—most commonly benzoyl peroxide, chlorine gas, or potassium bromate—to accelerate the natural whitening and maturing process that occurs during storage. The bleaching process breaks down carotenoid pigments in the flour, producing a bright white color, while also improving the flour's baking properties by strengthening gluten networks and increasing water absorption capacity. Bleached flour is made from the endosperm of wheat kernels after the bran and germ have been removed, resulting in a refined grain product with relatively low fiber and micronutrient content compared to whole wheat flour.

The chemical treatment also creates a flour with finer granulation and improved shelf stability. Most bleached flour sold commercially in North America is all-purpose flour, though bleached cake flour and bread flour varieties also exist. The bleaching process is regulated by food safety authorities and deemed safe for human consumption, though some bakers and consumers prefer unbleached alternatives for perceived nutritional or flavor reasons.

Bleached flour is widely used in baking for cakes, pastries, cookies, and quick breads where a light crumb structure and tender texture are desired. The improved gluten development makes it suitable for most general baking applications, though it is less ideal for bread-making compared to specialty bread flours. In North American cuisine, bleached all-purpose flour serves as the standard for biscuits, muffins, and soft-textured baked goods.

The flour's whiteness and consistent performance make it preferred in commercial baking and home baking where visual appearance and predictable results are priorities. It can be substituted for unbleached flour in most recipes, though some bakers report slight differences in texture and browning. Bleached flour is less common in European baking traditions, where unbleached flour and time-matured flours remain preferred.