Lignum nephriticum cup product of narra wood (the namesake from the province) manufactured opalescent colours when h2o is poured into it. These wood cups were A serious pre-colonial and colonial field of Naga. Naga could be the native pre-colonial title of the town. It's named following the narra tree https://casper7799888.laowaiblog.com/27635204/what-does-23naga-mean