这个在大美大家拿是合法的漂白： Bleached Flour

Bleached flour uses bleaching agents (commonly benzoyl peroxide and chlorine gas, among others) to speed up the flour’s aging process. This results in a whiter, finer-grain flour with a softer texture. Some people with sensitive palate can notice a difference in taste with bleached flour.

The bleaching process softens the flour, the effects of which are reflected in finished baked goods. Foods made with bleached flour tend to have a softer texture, more volume, and a brighter color than those made with unbleached flour.

Bleached flour is best for making cookies, pie crusts, quick breads, muffins, and pancakes.

 

https://www.thekitchn.com/whats-the-difference-between-bleached-and-unbleached-flour-223858