Beet sugar and cane sugar are essentially the same chemical: both are composed of around 99.9–99.95% pure sucrose (C12H22O11) and are considered chemically identical in refined form
While they may be chemically the same they are not identical. Sugar from beets has fiber in it that will never dissolve. Cane sugar dissolves entirely. As a baker I always used cane sugar. Nothing worse than “gritty” frosting!
“Sugar from beets has fiber in it that will never dissolve.”
Myth