Lignum nephriticum cup product of narra Wooden (the namesake of the province) produced opalescent colours when h2o is poured into it. These wood cups were A serious pre-colonial and colonial market of Naga. Naga is the indigenous pre-colonial name of the town. It is named after the narra tree https://mylessgscn.anchor-blog.com/7649413/examine-this-report-on-23naga