From: 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
Coefficient
Value
\({c}_{1}\)
\(0.3410\)
\({c}_{2}\)
\(0.2704\)
\({c}_{3}\)
\(-7.377\times {10}^{-2}\)
\({c}_{4}\)
\(-0.1441\)