Dyeing method |
| Simultaneous oxidation dyeing | Post-oxidation dyeing | ||||||||||||
Colourimetric value |
| L* | a* | b* | C* | ΔE*a | L* | a* | b* | C* | ΔE*a | ||||
Bio-catechols |
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(+)-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 | ||||