Abstract: A skin treatment composition of the present invention is an external composition for skin comprising an alkylene oxide derivative expressed by Formula (I): R1O—[(AO)m(EO)n]—R2??(I) wherein AO is an oxyalkylene group of C3 or C4; EO is an oxyethylene group; m and n are 1?m?70 and 1?n?70 respectively, wherein EO is 20˜80% by weight with respect to a total of AO and EO; each of R1 and R2 is a hydrogen or a hydrocarbon group having C1-4. The alkylene oxide derivative (I) has a moisturizing effect, a rough skin improving effect, a stickiness improving effect, and a transdermal absorption promoting effect. When a refreshing agent is used together therewith in the composition of the present invention, the refreshing effect lasts for a long time and it is excellent in feeling of use without skin stimulation.

Abstract: The invention provides a color-developing composition without using a pigment or dye and capable of being colored sustainably and stably after mixing two liquid phases which are colorless before mixing. The composition consists of two discrete liquid phases, wherein the refractive index of each liquid phase is identical to each other at a point within the wavelength range from 400 nm to 800 nm, wherein a continuous layer and a dispersion layer are formed by mixing and dispersing said two phases whereby developing a color. Alternatively, the composition is a powder dispersion consisting of a liquid phase and a silica powder-containing solid phase, wherein said liquid phase has a refractive index n1 and said silica has a refractive index n2, which satisfy Equation (1): |n1?n2|<0.05??(1) whereby developing a color on the basis of the difference in the refractive index at the interface between the liquid phase and the solid phase.