Lignum nephriticum cup made from narra wood (the namesake of the province) created opalescent colors when water is poured into it. These picket cups were a major pre-colonial and colonial industry of Naga. Naga could be the native pre-colonial identify of the town. It is named following the narra https://jeffreyxjvgq.blogozz.com/27772086/23naga-for-dummies