... ) envirenment friend a. short light storage time, long lasting luminous time, high brightnessabsorb any kind of visible light(sunlight, lamplight ... equipment signs and caution signs.materials of photoluminous safe signs:PVC, acrylic, aluminum alloy, stainless steel, ABS plasticsizes of ... scutcheon is that the printing ink silk was printed by luminous printing ink, can glow in the dark palce for ...