Sorry, I don’t know the specific reason why the skin of Ruoqiang gray dates turns black after cooking. However, I can introduce you to Ruoqiang gray dates.

Ruoqiang Gray Date, also known as Gray Date, is produced in Ruoqiang County, Xinjiang. It is famous for its thick flesh, small core and fleshy flesh, and sweet taste. In terms of cooking, it can be used to make various delicacies, such as red date soup, red date rice, etc.

As for the problem that the skin of Ruoqiang gray dates turns black after cooking, it may be related to the variety, maturity, freshness, etc. of the dates. In addition, it may also be related to factors such as cooking time and temperature.

First of all, if the varieties of Qianghui dates are different, the color after cooking may be different. Some varieties of gray dates may become darker in color after cooking, while others may not change much.

Secondly, the freshness and maturity of gray dates will also affect the color after cooking. If the gray dates are left for a long time after being picked, or are not fully ripe, the color may become darker after cooking.

In addition, cooking time and temperature are also important factors affecting the color of gray dates. If the cooking time is too long or the temperature is too high, the components in the gray dates may change, causing a change in color.

In general, the reason why the jujube skin turns black after cooking may be related to the variety, maturity, freshness, cooking time, temperature and other factors. If you want to know more about the specific situation, it is recommended to check the recipes of the relevant ingredients or consult a professional chef.