Wall Materials and Manufacturing Techniques for Korean Ancient Mural Paintings (Great Gaya, 6th Century)—Discovery of Shells Used in Wall Plaster and Identification of Their Processing Status

This study used morphological analysis to identify the materials for wall plaster in Goa-ri Tomb and elucidate manufacturing techniques by determining processing conditions ingredients through a calcination experiment. A glossy nacreous layer (or folia layer) an adductor muscle scar were identified on ventral of shell. The shell section was confirmed form lens-like prismatic chalky inserted between layer). calcinated samples showed clusters polygonal particles different sizes. experiment process plate-type–bedded structures converting into shapeless followed recrystallization. at 650 °C 750 mostly structures. According results study, walls be made oyster shells. existence many incompletely indicates that temperature not high enough or heat evenly distributed. weaker less durable shells, which seems have caused extensive exfoliation from surfaces.