The basis includes purity, color value, sulfur content, conductance ash, etc. The refined grade has less water and high sweetness.
White sugar has large particles, less water and high sweetness.
Rock sugar is a kind of ice-like crystal made from white sugar by dissolving in water, removing impurities, clearing juice, evaporating and concentrating, and then cooling and crystallizing, which has the functions of invigorating the middle warmer, benefiting qi, regulating the stomach and moistening the lungs.