The NRICH published Plastering Techniques Depicted in Salleung Uigwe (Royal Protocols for Tomb Construction), compiling and translating ancient literature on traditional plastering.
The Salleung Uigwe is to the part of Joseon-era royal protocols dealing with ceremonies, procedures and construction techniques in relations to tomb construction and Nijang refers to artisans who were in charges of applying soil, lime, cement and other materials on walls, ceilings and floors.
The technique used by Joseon-era nijang died away under the Japanese colonial rule and it is difficult to repair and restore heritage using the original method. The institute conducted researches in various ways including translating of ancient literature, investigating dismantling sites and listening to artisans to confirm traditional plastering technique which could be used for repairing cultural heritage.