In many cases artifacts we treat here were once temporally restored in the past using plaster for example. Proper restoration of broken earthen ware is usually very difficult. However it is significant for study and effective exhibitions, as they are representative materials, which are often designated as important cultural property. 　After decomposition and consolidation of the fragments, in order to complete a proper restoration, adhesives and fillings between fragments are replaced by new ones which are mainly epoxy resin as it is a suitable material.