Sulfur dioxide should be brought in by sulfur fumigation. In addition to whitening, sulfur can also prevent corrosion, and excessive use will cause harm to human body. Normal sugar should be light yellow. Don't choose products that are too white and too bright except to go to a formal place to buy rock candy. This kind of product is likely to exceed the standard of sulfur dioxide, and light yellow rock sugar is the safest.

Extended data:

There are basically three kinds of rock candy on the market. One is that the color is relatively white, not too transparent, one by one; A color is very white and transparent, which should be the best in appearance; Finally, there is a big yellowish rock candy, also called earth rock candy, which is made in a traditional way.

Sugarcane is the main raw material for sugar production, and the normal color of its rock sugar should be softer light yellow. The three mentioned above, the first one is edible with low sulfur dioxide content;

Secondly, the content of sulfur dioxide obviously exceeds the standard, which will cause harm to human body after eating; He suggested that the public choose the third kind of rock sugar, which is the safest. Because this yellowish rock candy is not beautiful, but using traditional technology, generally speaking, sulfur dioxide will not be added.

Phoenix net-yellow rock sugar is safer

People's Daily Online-How to Make Rock Sugar Industry insiders say that two-thirds of rock sugar in the market contains sulfur dioxide.