Dyeing method

Simultaneous oxidation dyeing

Post-oxidation dyeing

Colourimetric value

L*

a*

b*

C*

ΔE*^a

L*

a*

b*

C*

ΔE*^a

Bio-catechols

(+)-Catechin

(Cat)

58.4

16.90

53.90

56.50

33.40

54.4

18.7

37.7

42.1

26.20

(?)-Epicatechin

(EC)

58.3

16.90

45.70

48.80

27.30

62.5

15.5

40.3

43.2

20.70

L-3,4-Dihydroxyphenylalanine

(DOPA)

38.6

0.890

6.27

6.33

40.50

57.6

0.810

11.2

11.2

22.50

Hematoxylin

(HX)

35.1

6.22

21.30

22.20

38.70

49.4

−0.690

10.6

10.6

29.30

Brazilin

(BZ)

49.4

12.10

25.90

28.50

25.30

57.5

7.30

18.8

20.1

18.00

Rosmarinic acid

(RA)

65.0

3.89

21.40

21.70

10.00

66.0

4.19

22.4

22.8

8.61

Caffeic acid

(CA)

65.8

3.85

22.90

23.20

8.48

64.1

6.11

22.6

23.4

10.30

Chlorogenic acid

(ChA)

70.5

4.18

25.70

26.10

3.03

70.9

4.25

25.8

26.1

2.70