Chlorine- and Chlorine Dioxide-Bleached Flour

Last reviewed October 19, 2026

In plain words: Chlorine (INS 925) and chlorine dioxide are gases used to bleach and mature flour. Chlorine is used for cake flour and chlorine dioxide for bread flour, mainly in the US.

Identity

Chlorine- and chlorine dioxide-bleached flour. Number: chlorine, INS 925. Function: flour treatment / bleaching and maturing agent. Typical foods: cake flour (chlorine), bread flour (chlorine dioxide), mainly US. What it is: gases used to treat flour.

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This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.