Lignum nephriticum cup manufactured from narra wood (the namesake in the province) manufactured opalescent colours when water is poured into it. These wood cups were being a major pre-colonial and colonial sector of Naga. Naga would be the indigenous pre-colonial name of the town. It is actually named following https://situsslotantirungkat13333.eedblog.com/28221038/5-simple-statements-about-23naga-explained