Peng Hui contains lead and arsenic, but the content is far below the national standards, so it is edible and harmless to the human body.

The main component of Penghui is potassium carbonate, with a molecular formula of K2CO3 and a molecular weight of 138.

Peng Hui is a kind of grass ash burned from Peng firewood, which has been used for hundreds of years.

In addition, Penghui is only used in Lanzhou beef noodles and there is no national standard to enforce.

After adding it to ramen, it can increase the taste of ramen and make it more "strong".

It is also used in dough, a special type of pasta in Wuwei, Gansu.

One of the ash currently used on the market is made from burning thorn grass, and the other is prepared by companies based on the ingredients of the ash. The ash contains lead and arsenic, but the content is far lower than the national standards.

The Health Supervision Institute has been conducting random inspections of the ash used in beef noodle restaurants on a regular and irregular basis, and found that the lead and arsenic content of the prepared ash is lower than that of the fired ash.

Expanded information: The function of gray canopy: gray canopy, also called water canopy, flying canopy and pengchai in some places.

Born in hills, mountains, and deserted beaches, it is a plant with high alkali content and grows from seeds.

When it sprouts, it has two very small, very tender, very green leaves. When it grows up, it becomes a fluffy shape. The stem is silvery white, and the leaves are as small as needles, resembling the antlers on a deer's head, and also like a bright green fruit.

Small yellow flowers bloom in autumn, and the flowers fall and set seeds. After setting seeds, the leaves turn yellow and fall, leaving only the branches and seeds. The seeds fall off when the wind blows, and they will grow again next year.

The alkaline content of the gray canopy is strong, and the grains contain a lot of starch, so they can be used as feed.

During the three-year difficult period, people ground the seeds to satisfy their hunger, which was bitter and difficult to swallow.

The black stone used to cook "alkaline water" mentioned in the eleventh episode of the Japanese cartoon "The Little Master of China" is Peng Hui.