Specifications: This glow-in-the-dark thread is made of "LumiNova" phosphorescent pigment,and its afterglow luminance power is different from the one on ordinary phosphorescent threads in the market.Recommendable application is to use not only as embroidery thread on garments but also on various kinds of personal effects such as bags. As LUMINOUSTAR glows after absorbing energy from the light,afterglow brightness varies proportionally depend on the kind of the light source and/or its excitation time.lrradiation with sunlight or black light is most recommendable.(LumiNova is produced by Nemoto & Co.,Ltd.) *Micro-grains of the phosphorescent agent might damage the thread guide.