... 8-12 hours in the darkness.2)Photoluminescent sign can be used for directional signs, building paltes, door *****Packing:Paper Carton or ... /ink/printing slurry, Photoluminescent Ceramic(enamel) Glaze, photoluminescent stone/pebble, photoluminescent film/tape, photoluminescent PVC sheet / rigid board, photoluminescent Masterbatch and various photoluminescent safety sign, etc ...