Differences of Surface Visual Physics Magniture of Three Kinds of Timber Before and After Painting

Determinations were conducted on visual physics magnitude of Entandrophragma cylindricum, Guibourtia tessmannii and Fraxinusmandschurica wood before and after painting alkyd varnish. The results show that painting reduced the luminance (L*) and the chrominance (a*) oftested wood specimen, the biggest change L* was specimen of G. tessmannii wood with obvious decrease of luminance. The absolute value (Δa*) ofF. mandschurica wood was the largest, greener than that of untreated one. The chrominace (b*) of three kinds of wood specimen increased afterpainting, and the absolute Δb* was ordered by specimen of F.mandschurica > G. tessmannii > E. cylindricum. Chrominance aberration (ΔE*) oftested wood specimen had little difference before and after painting.