Lignum nephriticum cup made from narra wood (the namesake from the province) developed opalescent colors when drinking water is poured into it. These picket cups had been A significant pre-colonial and colonial sector of Naga. Naga is the native pre-colonial title of the town. It's named after the narra https://israelnivgs.yomoblog.com/34358981/a-simple-key-for-23naga-unveiled