Since the surface of the hair is covered with a fatty layer consisting of 18-MEA, the hair has water repellency and gloss, which gives it a smooth texture. However, if the hair undergoes physical or chemical damage, the lipid layer is peeled off, and a hydrophilic layer of protein appears. Therefore, there is no gloss to the hair, and it is easily entangled. In addition, if the structure of the hair is damaged, the components inside the hair leak easily, so the body of the hair is reduced. In other words, the damage occurring at the surface of the hair changes it from hydrophobic to hydrophilic. We show the changes in the hair which we have confirmed by using ionic fluorescent reagents.

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This study proposes a novel evaluation method for quantifying perceived translucency using statistical facial image analysis. Most conventional evaluation methods for impressions, including perceived translucency, typically use the skin of a certain “part” of the face as representative for evaluation. However, we anticipate that most impressions such as perceived translucency would be recalled from features of the face as a whole, or from various parts of the face (not from one specific area). Therefore, a novel evaluation method that targets images of the entire face should be proposed instead of the conventional methods. In order to develop such a facial image analysis, we employed an image analysis based on principal component analysis (PCA) that is useful for analyzing textural features of the entire face. To begin with, as the learning data necessary for “statistically” extracting the facial textural features, we created a database of shape-normalized facial image data where all of the facial shapes were normalized (unified) and only the facial textures were different. Next, we obtained the eigenspaces that express the textural features of faces using PCA. As the last step, by using the characteristics of eigenspaces, we developed a novel “Eigen residual accumulation method” that would allow us to quantify textural features of faces. The comparative evaluation between the proposed method and subjective assessment for the perceived translucency of faces showed that the method quantifies the level of the translucency with high accuracy.

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We have developed perfluoroalkyl modified silicone oil (FSO) which could improve the long-lasting performance of cosmetics. FSO is superior in usability but it lacks sufficient adhesion and sebum-resistant properties. Therefore, we tried to develop a novel perfluoroalkyl/alkyl (Rf/Rh) co-modified silicone wax (FSW) which would improve long-lasting performance dramatically with the use of FSO. The contact angle value (to squalane) of FSW/FSO oil wax gel scored remarkably high when the Rh/Rf ratio was specific. We concluded that the contact angle value became high when FSO was held in FSW fine crystals whose growth was mutually inhibited by Rh and Rf. The liquid foundation using FSW/FSO was highly valued on the point of persistence compared to one using only perfluoroalkyl modified silicone wax/FSO.

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Facial sagging is one of the well-known morphological changes associated with aging. Several methods to measure facial sagging degree have already been reported including 2-dimensional (2D) and 3-dimensional (3D) analyses. However, there are no protocols to measure the ‘absolute sagging quantity’. In this study, we attempted to estimate the ‘absolute facial sagging quantity’ by a simple 2D analysis without using any high-cost machine. In our new 2D method, measured sites are marked on the face. Then, facial pictures in the supine and sitting position are taken, making sure that both pictures have the same facial angles. Next, only for the supine position, a ‘sagging measurement sticker’ with a concentric 1 mm interval scale is attached on each measuring site to evaluate the absolute sagging quantity. The two pictures are overlaid and the moving distance of each site is calculated with the ‘sagging measurement sticker’. Our new method was clinically evaluated in females in their 20s to 50s. Furthermore, the remedial effect of a formulation was examined in women in their 40s. Through these studies, it is suggested that sagging of the face line leads to nasolabial folds, and this method can be useful to evaluate these little changes before and after a treatment.

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