Although both white sugar and rock sugar are hard crystals in texture, the particles of white sugar are small and uniform, while the particles of rock sugar are large and irregular. From the production process, white sugar is first extracted from sugar cane or sugar beet, and then further extracted from brown sugar to become white sugar. Rock candy is to add a certain proportion of water to white sugar and melt it. Then it is crystallized through the production process to form rock sugar. Compared with the taste, the sweetness of sugar is slightly higher than that of rock sugar. White sugar has a cooling effect. Eating tomatoes mixed with white sugar in summer can cool off the heat. And rock sugar and pear boiling can treat cough, moisten the lungs and resolve phlegm.
Rock candy should be placed in a cool and ventilated place because it is easy to absorb water and get wet. If the crystal sugar is found to be damp, it can be dried with an electric fan or exposed to the sun until it is dry. However, if it is found that there is water on the surface of rock sugar, it is better not to eat it because it is inconvenient to handle at home and easy to breed bacteria.