It is quartz sand.

The color of the sand itself is not black, but white, because of the long time of frying, it changed color. The sand used for frying chestnuts is quartz sand, which is used exclusively for frying. Preparation of sand, to choose clean and uniform particles of fine sand, washed with water, through the sieve, sunshine, and then with caramel, tea oil mixing and frying into "cooked sand" to use.

Fried chestnuts rely on sand to transfer the temperature, the smaller the sand, the more uniform the heat, this round particles of fried sand insulation performance is high, basically constant temperature, and not fragile, easy to sieve and easy to leak, you can maximize the chestnuts to ensure that the taste. But after a long time, the sand particles will become bigger and bigger, so the sand can not play its role, it will be eliminated.

Extended information

Chestnut role

1, relieve emotions

Chestnut contains a variety of trace elements can ease emotions, inhibit pain, for the mother-to-be frequent emotional instability has a certain role in alleviating.

2, improve immunity

Chestnuts are rich in high-quality protein, and contains a variety of amino acids needed by the body, which is conducive to improving the mother-to-be's immunity, and help the development of the fetus.

3, benefit qi and spleen

Chestnuts are dried fruit varieties with high carbohydrate content, can supply the body with more heat, and can help fat metabolism, with the benefit of qi and spleen, thick and complementary gastrointestinal effects.

4, anti-aging

Chestnuts rich in unsaturated fatty acids and vitamins, minerals, can prevent and control hypertension, coronary heart disease, atherosclerosis, osteoporosis and other diseases, is anti-aging, prolonging the life of the nourishing good.

People's Daily News - sugar fried chestnuts why black sand?

People's Daily Online - How to do sugar fried chestnuts? Teach you 3 super easy ways to do it