Lignum nephriticum cup made from narra Wooden (the namesake of the province) developed opalescent colors when h2o is poured into it. These wooden cups have been An important pre-colonial and colonial industry of Naga. Naga could be the native pre-colonial name of the town. It's named following the narra https://devinqepbl.blogmazing.com/27773807/not-known-details-about-23naga