Shittori feel is defined as a texture that is moderately moisturized; however, many people experience ‘ shittori feel’ when they touch a dry solid material containing little liquid. Here, shittori feel was evaluated for 12 materials. We found that the highest score of shittori feel was achieved by powders. Multiple regression analysis showed that shittori feel is a complex sense of moist and smooth feels. We analysed the relationship between the physical properties and the moist/smooth feels to show how subjects felt certain feels simultaneously. The moist and smooth feels are related to the surface roughness and friction characteristics of the materials. The moist and smooth feels can be perceived when the finger starts to move on the material surface and when the finger moves and rubs the material surface, respectively.

Shittori feel is defined as a texture that is moderately moisturized and is one of the most favorable textures for many Japanese. In this research, we studied the relationship between the tactile and physical properties of cosmetic powders to determine the specific factors that make up shittori feel. We selected nine cosmetic powders with different sizes, shapes, and touch to conduct physical and tactile evaluations. These evaluations suggested that shittori feel is a complex combination of moist and smooth feels induced by a frictional phenomenon on skin. The moist and smooth feels are perceived when the finger starts to move and when the finger rubs the powders, respectively.

No abstract

IntroductionSara-sara is a Japanese onomatopoeia originally meant to represent the sound that occurs when light objects touch each other or when water flows shallowly 1 . However, a new meaning, i.e., a state in which things are not damp or sticky and feel dry, has been added to this definition. At present, the Sara-sara feel is a preferred tactile sensation when people touch human skin, hair, clothing, and cosmetics.Sara-sara is important when touching powder, because the sensation is related to the tactile and lubrication properties of cosmetics and other daily products. Yamamoto et al. have found that this sensation occurs when touching powder with a grain size greater than f10 µm 2 . Oheda et al. have reported that Sara-sara is a comforting tactile feel for powder cosmetics 3 , and Sambe et al. have shown that this sensation is desired for antiperspirant powder, which refreshes sweaty or greasy skin 4 .Although Sara-sara is a common and important sensation in several industrial fields, there are few reports on its physical origin. Kamikawa et al. have evaluated the tactile texture of cosmetic powders and oils and found that both

No abstract