South red glue injection is a common jewelry processing technology, which is used to improve the appearance and texture of South red agate. This process includes coating a layer of colloid on the agate surface to increase luster and transparency. Under normal circumstances, the glue used in Nanhong injection is harmless and will not cause direct harm to human body. Some chemicals such as formaldehyde will be produced in the process of injecting glue into Nanhong. These substances will have certain influence on human body under certain conditions. As long as you avoid long-term large-area contact, it will not have much impact on your body. When buying south red agate, you should choose a reputable merchant to ensure the good quality of the purchased products. If South Red Agate contains too many artificial additives, it will affect its value. It is recommended to choose carefully and avoid buying products with poor quality.