Recognition Mechanism of the “<i>Sara-sara</i> Feel” of Cosmetic Powders

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

Friction Dynamics of Commercial Artificial Hair

“…The frictional properties determined in this study may affect the tactile texture of the artificial hair. Previous studies have reported that smoothness or slipperiness is enhanced when the μ and the change in the kinetic friction process are small, while coarseness is enhanced when the surface is uneven [28,38,39]. In the present study, the artificial hairs derived from human hair, S 1, S2, and LW1, had significantly smaller a values, reflecting the dependence of F on W. These results suggest that the tactile texture of these artificial hairs is smooth.…”

Friction Dynamics of Foaming Body Cleansers under Sinusoidal Motion

“…The relationship between these friction parameters and the function and usability of foaming body cleansers is not clear. However, our previous studies have shown that friction parameters correlate with the tactile texture of cosmetics: The smoothness and slipperiness are higher when the kinetic friction coefficient µ k , is smaller 11,25,26) . At present, predicting what tactile textures might result from the products in groups 1 and 2 with high friction coefficients is difficult.…”

Product Quality towards Brand Loyalty in the Cosmetic Industry

“…Additionally, consumers' preferences and behaviors are constantly evolving, making it challenging for brands to keep up with their changing needs and expectations [3]. Lastly, factors such as the prioritization of convenience, price, and quality over brand identity in recent years contribute to the diminishing relevance of brand loyalty [4].…”