The making process of rock sugar

There are many technological processes for making rock candy, and the following is one of them:

1. Choose 50kg of white sugar, add 10kg of clear water and mix well to make the sugar fully soluble in water.

2. Before boiling, add vegetable oil to the interlayer of the sandwich pot, then pour the prepared sugar solution into the upper pot and boil it with fire. When the sugar solution is boiled for 5-6 minutes, add 0.5 kg of saturated alum solution at room temperature, and mix thoroughly while adding. When the temperature of sugar solution measured by thermometer rises to 150℃, cease fire and cool.

3. When cooking, the optimum temperature is 1 15 ~ 120℃. Take the sugar solution out of the pot and put it in the pot. Cover the pit with a clean quilt. Keep the temperature in the pot at about 90℃ that day, and then reduce the temperature by 10℃ every day until the seventh day.

4. If the temperature is not enough, fire can be added to increase the pit temperature. In general, sugar solution is neither afraid of cold nor heat during crystallization.