The main ingredient in boron ash is potassium carbonate, molecular formula K2CO3, molecular weight 138. boron ash is made from burnt grass, which has been used for hundreds of years. In addition, the ash is only used in Lanzhou beef noodles, and there is no national standard to enforce. When added to ramen noodles, it can increase the texture of the noodles and make them more "strong". There is also a specialty noodle dish in Gansu Wuwei, added to use. Now on the market to use the ash a kind of grass burnt, one is the enterprise according to the composition of the ash formulated, the ash contains lead, arsenic ingredients, but the content is far below the national standard. Health supervision has been regularly irregularly on the beef noodle museums using the ash sampling, found that the preparation of the ash lead, arsenic content is lower than the burnt ash.