This study was performed to determine the effects of bleaching and impregnation processes on the hardness of the varnish layer in beech wood. For this purpose, samples were impregnated with Tanalith-CBC and Immersol-WR 2000 and bleached with the solution groups (18%) NaOH+H2O2, NaOH+ Ca(OH)2 +H2O2, NaOH+ MgSO4+ H2O2, NaHSO3+H2C2O4.2H2, NaSiO3 +H2O2, KMnO4 +NaHSO3+H2O2. Synthetic varnishing was used and the hardness of the varnish layer was determined according to ASTM-D-4366. The mean hardness values (swing) of the control samples were found to be 35.57 for unimpregnated and varnished samples, 23.50 for samples treated with solution groups and varnished samples, 45.78 for un-varnished samples and samples impregnated with tanalith-CBC, 26.57 for samples impregnated with tanalith-CBC treated with solution groups and varnished samples, 40.54 for un-varnished samples and samples impregnated with Immersol-WR 2000, and 23.21 for samples impregnated with Immersol WR-2000 treated with solution groups and varnished samples. It was found that impregnation and bleaching materials did not affect the hardness of the varnish layer. However, while impregnation materials increased the hardness of wooden material, solution groups resulted in a decrease in hardness. These results show that synthetic varnish can be used after bleaching and impregnation processes furniture.

This study was performed to determine the effects of bleaching and impregnation processes on the hardness of the varnish layer in beech wood. For this purpose, samples were impregnated with Tanalith-CBC and Immersol-WR 2000 and bleached with the solution groups (18%) NaOH+H2O2, NaOH+ Ca(OH)2 +H2O2, NaOH+ MgSO4+ H2O2, NaHSO3+H2C2O4.2H2, NaSiO3 +H2O2, KMnO4 +NaHSO3+H2O2. Synthetic varnishing was used and the hardness of the varnish layer was determined according to ASTM-D-4366. The mean hardness values (swing) of the control samples were found to be 35.57 for unimpregnated and varnished samples, 23.50 for samples treated with solution groups and varnished samples, 45.78 for un-varnished samples and samples impregnated with tanalith-CBC, 26.57 for samples impregnated with tanalith-CBC treated with solution groups and varnished samples, 40.54 for un-varnished samples and samples impregnated with Immersol-WR 2000, and 23.21 for samples impregnated with Immersol WR-2000 treated with solution groups and varnished samples. It was found that impregnation and bleaching materials did not affect the hardness of the varnish layer. However, while impregnation materials increased the hardness of wooden material, solution groups resulted in a decrease in hardness. These results show that synthetic varnish can be used after bleaching and impregnation processes furniture.