Natural dye extracted from Dalbergia cochinchinensis residue with water fastness, mildew resistance and permeability properties for wood staining

Abstract Wood dyed with extracts from Dalbergia cohinchinensis residues as natural dye (ND) exhibited desirable color appearance and anti-UV property while the potential property of the ND dyed wood has not been exploited with respect to the water fastness, mildew resistance along with the penetrability of the ND on wood blocks dyeing. The present study was aimed at exploring these aspects for multifunction assessment of the ND dyed wood. The results showed that the ΔE* (4.58) and color intensity reduction (PR:14.01%) of the ND dyed wood declined slightly after washed treatment by comparison with that of acid red (ΔE*:32.82; RP:76.14%) and reactive red (ΔE*:26.85; RP:66.52%) dyed wood indicative of its preferable waster fastness due to the surface hydrophobicity improvement. In addition, the ND ameliorated the mildew resistance against Aspergillus niger and Trichoderma viride infection. Interestingly, the wood blocks inner can be completely impregnated with ND under atmospheric pressure dyeing process without any pretreatment and auxiliary adding. The extracts utilization scenario was proved to perforce greatly promising for industrial application in terms of multifunctional ND dyed wood preparation.