Wood Research Journal, cilt.15, sa.2, ss.37-42, 2025 (Hakemli Dergi)
In this study, some surface changes (color parameters, whiteness
index (
WI
*), and glossiness) occurring after the
application of single [oxalic acid (C
2
H
2
O
4
)] and double component [sodium hydroxide (NaOH) + hydrogen peroxide (H
2
O
2
)]
wood bleaching chemicals on naga (
Brachystegia cynometroides
) wood were investigated. Th
e bleached surfaces were
compared with the unbleached surfaces. According to the obtained results, the ∆
E
* values were determined as 2.99 for C
2
H
2
O
4
chemical and 16.95 for NaOH + H
2
O
2
chemical. Significant results were found for all tests in the analysis o
f variance. Increases
in
b
* and
C
* values were observed with C
2
H
2
O
4
, while decreases were observed with NaOH + H
2
O
2
chemical. With both wood
bleaching chemicals, increases were found in
WI
* values in parallel directions to the fibers, as well as in ho and
L
* values, while
decreases were obtained in glossiness values at 60 and 85 degrees in both parallel and perpendicular directions to the fibers
,
and in
a
* values
