Abstract
This study added Haematoxylon campechianum dye‚ propylene glycol‚ and menthol in henna, and carried out 8 times of shampoo dyeing. The experimental results showed that the L∗ values of the dyed hair pieces‚ containing 5% and 7% Haematoxylon campechianum‚ were 32.1 and 30.2‚ respectively. The addition of 7% Haematoxylon campechianum dye extract in the hair dye to coat on 3 groups of hair pieces showed that‚ there is no significant difference (P›0.05) between the ΔE mean value 16.68±0.30 of the 3 groups of hair pieces after 8 shampoos‚ and the ΔE mean value 16.29±0.43 of the 7th shampoo. This result indicates that the degree of hair color fading tends to be smooth after the 7th shampoo.The L∗ mean value 33.36 of the 8th shampoois significantly different from the 56.33 of bleached hair color, indicating that after 8 shampoos‚ hair color lightness can still fade. The hue a∗ b∗ mean values decrease from 12.95 and 11.59 after the 1st shampoo to 3.34 and 7.79 after the 8th shampoo‚ respectively‚ and the hair color obviously changes from red to brown. This hair dye increases the tensile strength of the bleached hair by 53.69%.The experiments proved that henna mixed with Haematoxylon campechianum dye, propylene glycol‚ and menthol can withstand more than 8 times of shampooing, and it can effectively cover white hair and strengthen hair.
