Mechanical properties of white clay used as wall painting substrate material: measurement of strength and modulus of elasticity of simulated substrate material of wall paintings Hiten at Kondo, the main hall at Horyu-ji Temple

Heritage Science

Table 1 Mass compositions of white clay used in Horyu-ji Temple and Amakusa pottery clay (%)

	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	Alkali	Ignition loss
Fragment of wall paintings at the main hall in Horyu-ji Temple (averaged value)	78.79	11.36	2.52	0.99	0.15	5.17	0.73
Amakusa pottery clay	78.03	14.50	0.68	0.06	0.13	–	4.61