A sign board capable of producing multi color visual effects upon {TAIL ~ exposure} to {HEAD ~ ultraviolet light}, said sign board comprising: 
A sign board capable of producing multi color visual effects upon { TAIL ~ exposure } to { HEAD ~ ultraviolet light } , said sign board comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH