1, the appearance of different: old rock candy is polycrystalline rock candy, the surface is relatively rough, no luster; and rock candy belongs to the single crystal rock candy, the surface is relatively smooth, and luster.

2, the purity of different: the purity of the old rock candy is not as high as the purity of rock candy, because there are no impurities in the rock candy, while there are impurities in the old rock candy.

3, the use of different: the old rock sugar is generally used in fried sugar color, marinated meat; and rock sugar is better melted, so generally used in tea.