Lignum nephriticum cup product of narra wood (the namesake with the province) manufactured opalescent shades when h2o is poured into it. These wood cups were being a major pre-colonial and colonial business of Naga. Naga will be the native pre-colonial identify of town. It's named after the narra tree https://lanegtgrd.webbuzzfeed.com/28666763/a-secret-weapon-for-23naga