I often learn new things from doing this blog. For example, today I noticed a small advertisement in a hundred-year-old magazine for Farwell & Rhines Gluten Flour. Since some people have health issues that require them to go gluten free (or at least minimize their use of gluten), I was surprised to see high gluten promoted. How did cooks in 1919 use this flour? . . . Did they mix it with other flours? Use if for bread making?
Gluten is a protein. Flours with higher gluten content rise better when making breads. According to SFGate, all-purpose flour typically contains 11-12% gluten. Bread flour is considered a high gluten flour, and it contains up to 13% gluten. Cake flours only have 7-8% gluten. There are also products sold that are just called “gluten.” Gluten is sometimes added to other flours to increase the gluten content when making bread.