Brown & Polson Corn Flour Starch 500gm The finely powdered white starch powder known as Brown & Polson Corn Flour is derived from maize kernels. While the starch is extracted from the kernel's endosperm, the flour is ground from the kernels. This maize flour has a bland texture and a pale white color. Use it as a batter for frying or as a thickening ingredient for your foundation! Now go ahead and purchase Brown & Polson Corn Flour online!