... sunlight) or lamplight for 10 minutes, then continuously glow in the dark more than 12 hours.b. stable physical and ... protectionno toxic, no harm, no radioactivity, no burning, no explosion, no heavy metalsusages of superlong afterglow luminous pigment:suitable for ... alarm, selfsaving tools, etc.b. safety fieldshow safety indication in the dark, such as signs, warming item, emergency passage way ...