Table 4 Statistical comparison of color change values for beech specimens subjected to heat treatment and heat-treated samples after bleaching treatment

− 0.50 (0.63)gh

0.52 (0.45)ı

− 3.72 (1.10)ef

3.89 (1.00)a

− 8.91 (1.45)c

1.72 (2.52)j

5.11 (1.41)hı

10.77 (1.40)g

− 10.82 (0.46)a

− 7.47 (0.51)a

10.78 (0.91)km

17.02 (0.85)mn

1.13 (0.88)jk

− 1.15 (0.68)gh

− 3.87 (1.22)ef

4.31 (1.27)a

− 0.23 (0.66)ghı

0.00 (0.40)ı

− 5.76 (0.97)cd

5.82 (0.96)b

− 6.32 (0.87)e

5.14 (0.60)m

4.12 (1.46)hı

9.23 (1.12)ef

− 10.04 (0.56)ab

− 5.00 (0.81)c

9.38 (1.28)k

14.66 (1.24)ıj

1.13 (0.70)jk

− 1.94 (0.66)efg

− 5.05 (0.93)de

5.60 (0.99)b

− 0.73 (0.64)fgh

− 0.39 (0.54)hı

− 7.05 (1.43)c

7.14 (1.43)c

− 7.71 (1.21)d

2.73 (1.18)k

0.92 (2.12)g

8.57 (0.99)de

− 9.76 (0.45)b

− 5.90 (1.18)b

7.53 (0.94)j

13.73 (0.72)ı

0.09 (0.72)hı

− 2.74 (0.56)de

− 6.11 (1.07)cd

6.76 (1.00)bc

− 1.05 (0.65)fg

− 1.55 (0.47)fg

− 6.08 (1.30)cd

6.43 (1.18)bc

− 6.65 (1.84)e

4.86 (1.01)m

4.72 (2.80)hı

9.88 (2.00)fg

− 10.03 (0.67)ab

− 4.67 (2.06)c

11.68 (1.74)m

16.19 (2.00)km

0.47 (0.49)ıj

− 2.46 (0.40)def

− 3.51 (0.98)f

4.36 (0.96)a

− 0.54 (0.60)gh

− 2.21 (0.52)ef

− 6.48 (1.26)cd

6.91 (1.25)bc

− 6.89 (0.63)e

4.55 (0.93)m

4.19 (1.28)hı

9.35 (1.07)ef

− 10.13 (0.70)ab

− 5.93 (0.99)b

10.38 (2.31)km

15.76 (1.88)jk

1.53 (0.47)k

− 2.30 (0.61)ef

− 4.96 (1.22)def

5.71 (1.28)b

− 1.01 (0.63)fg

− 3.33 (0.80)d

− 17.65 (1.91)a

18.01 (1.97)n

− 6.37 (1.21)e

0.41 (0.52)ı

3.94 (2.33)h

7.66 (2.11)cd

− 9.43 (0.67)bc

− 4.83 (0.46)c

5.50 (1.70)ı

12.01 (1.25)h

− 1.43 (0.54)f

− 4.63 (1.03)c

− 13.22 (0.85)b

14.11 (1.02)ı