The liquid for antigen detection is generally called buffer. Most of the liquids inside the New Crown Antigen Detection Kit are saline, and some are Tris-HCL, surfactant, purified water, Tween-20, PBS, Brij58, ultrapure water, and so on. Buffers mainly serve to extract antigens. Generally does not have a lot of toxicity, if accidentally touch a small amount by mistake, the problem is not big, there will be a possibility of slight inflammation, the general treatment is to use a large dose of water to rinse it. If a child is inadvertently exposed to a large amount of sample extract, please seek medical attention. The New Coronavirus Antigen Kit is available for self-testing at home. It is recommended to follow the instructions regularly.