Lignum nephriticum cup product of narra wood (the namesake from the province) generated opalescent colors when drinking water is poured into it. These wood cups had been A serious pre-colonial and colonial industry of Naga. Naga would be the native pre-colonial title of town. It's named after the narra https://marcoaqcnx.sharebyblog.com/27838378/helping-the-others-realize-the-advantages-of-23naga