Lignum nephriticum cup product of narra Wooden (the namesake with the province) generated opalescent colors when water is poured into it. These picket cups were a major pre-colonial and colonial industry of Naga. Naga may be the native pre-colonial name of the city. It is named following the narra https://casper7723333.actoblog.com/28492956/5-essential-elements-for-23naga