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[NORMAL] The Relationships between Dyeing Methods and Dyeability in Hair Colouring by Utilising Enzymatic Oxidation of (+) Catechin

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Figure

Figure 1. Chemical structure of (+)-catechin ((a) Cat) and catechinone (b).
Figure 3. Colour measurement results of hair samples undyed () and dyed by redissolution dyeing method with catechi-none with O2 gas introduced (), sequential dyeing method without () and with () O2 gas, simultaneous oxidation dye-ing method without () and
Figure 5 indicates that the other hand, the chemical oxidation of Cat with OOn the one hand, the dye formation is inhibited over 40over 520 nm increase with Oxidation sion may also be accelerated by heating
Figure 6. K/S spectra for the hair undyed (---) and dyed by redissolution Method with catechinone (a) or simultaneous method with Cat (b) at 20 (—), 30 (—), 40 (—), 50 (—) or 60˚C (—) in the presence of O2
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