Lignum nephriticum cup made from narra Wooden (the namesake of the province) produced opalescent colours when drinking water is poured into it. These picket cups had been A serious pre-colonial and colonial business of Naga. Naga could be the indigenous pre-colonial name of the town. It is named following https://andersonrcozl.bloggosite.com/34607269/not-known-factual-statements-about-23naga