Wheaten Flour.
Wheat was formerly ground by mill stones, and the product bolted and sifted into the different grades. But during the last twelve years, this process has been largely superseded by the “Patent Roller” process of crushing and separating the flour from the bran. This is a great improvement over the old method; more flour is obtained from the wheat, and it is whiter, contains more gluten, and is therefore stronger.
The first consideration is the color or whiteness; second, the quantity of gluten the flour contains. The eye determines the first, and a hasty test of the quantity and quality of the gluten may be made by squeezing some of the flour into a lump in the hand. This lump will more closely show the prints of the fingers, and will hold its form in handling with considerable more tenacity if the flour is good, than if it is inferior and deficient in gluten.
Grocers and bakers test flour by smoothing a little out on a board with a knife or paper cutter, to see its color, and if it contains specks of bran, etc., which may show that it has not been well bolted or “dressed.” To determine the quantity and strength of the gluten, they mix some of the flour with water, and judge by the tenacity of the dough—the length to which it may be drawn out by the fingers, or spread into a thin sheet.
Injury to flour is shown most quickly in the gluten, which may lose its vitality. The gluten of good flour will swell to several times its bulk under a gentle heat, and give off the pleasant odor of hot bread, while the gluten from poor flour swells but little, becomes viscous or nearly fluid, and smells disagreeably.