The fluorescent liquid used for wedding supplies on the internet is not acceptable. The fluorescent liquid of wedding supplies is "forced to emit light under the ultraviolet light from the ceiling of the hall", and once it leaves the ultraviolet light, it will stop emitting light immediately. What you need is "long afterglow rare earth thermoluminescence phosphor", which is a "safe luminescent material" without the harm of radioactive radiation, and the price is about 3000 yuan per kilogram. However, it is difficult for laymen to buy the real thing. You must order directly from the relevant research institute. For example, Beijing Rare Earth Materials Research Institute ("Northern Rare Earth Research Institute").