HAIR CARE
performed after lock equilibration (T0) and after the treatment (Final), and the results were expressed in arbitrary units (AU).
Results UV irradiation induced a change in the red colour of the hair locks for the placebo shampoo. This effect was visible by the increase at the a* value by 2.5% (redder). At the same time, after the treatment with 1%, the oil blend shampoo maintained the colour parameters, showing a clear hair colour fade protection. The comparison between the two products
showed a statistically significant difference after the treatment procedures for the red colour variable: Regarding the conditioner UV protection
activity, UV irradiation induced a change in the red colour and tone of the hair locks in the placebo. This effect was visible by a significant decrease
in L* of 6.2%, a non-significant increase in a* of 0.4 % (redder), and a significant increase in b* of 8.0% while 1% oil blend conditioner induced a significant decrease in a* (red colour) of 2.6 %. The comparison between the two products
showed a statistically significant difference after the treatment procedures for the red colour variable:
Siltech 2ChAd 21.qxp_Layout 1 02/03/2021 14:16 Page 1
Evaluation of the nourish/shine efficacy The study aimed to assess nourish and shine efficacy of a conditioner dosed with 1% oil blend compared to placebo.
1% Shampoo conditioner■ Placebo Shampoo ■ 3 1 -1 -3 Final
Figure 4: Hair red colour change during the study after UV radiation + 1% Ethomega conditioner application vs placebo. Mean values of all locks (n=8). Also shown is the statistical comparison between the two products. (*: p<0,05)
Protocol Four African hair locks were prepared and equilibrated after being washed with either shampoo, placebo, or conditioner, letting the products work for 5 min. Measurements were obtained in 5 different points along the length of the fibre. For the successive measurements, the measurement positions were conserved. The measurement was based on reflection.
Parallel white light is created by LEDs in the probe head. Two separate measurement channels measure the direct reflected light (again guided by a mirror at the same angle into the reflection channel) and the diffuse reflected (scattered)
light. The scattered/diffuse reflected light is measured at 0° (completely vertically above the measured surface) under the assumption that light is scattered in the same way overall degrees (diffuse channel). The Glossymeter GL 200 expresses both, the portion of directly reflected light (gloss) and the diffusely scattered portion from the hair surface. The measurements were performed after lock
equilibration (T0) and after the treatment (Tfinal) and the results were expressed in arbitrary units (AU).
The measurement of the hair nourish effect was made using Visioscan® VC 98. This system uses
-2.6* 0.4
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April 2021 PERSONAL CARE
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