Lignum nephriticum cup product of narra Wooden (the namesake on the province) generated opalescent colours when water is poured into it. These picket cups have been a major pre-colonial and colonial business of Naga. Naga could be the native pre-colonial title of town. It's named following the narra tree https://agenslotonline23332.weblogco.com/28212120/5-simple-statements-about-23naga-explained