It is intended to provide compositions showing color-development without resort to any pigments or dyes which are colorless before mixing two liquid phases but capable of developing a color after mixing; and compositions showing stable color-development continuously. Namely, color-development compositions comprising two separated liquid phases having the same refractive index within a range of from 400 to 800 nm characterized in that, when these two phases are mixed together and dispersed, a continuous phase and a dispersion phase are formed, thereby achieving color-development; and compositions in the form of a powdery dispersion comprising a liquid phase and a solid phase containing a silica powder characterized in that the liquid phase has a refractive index n1 while the silica has a refractive index n2 and n1 and n2 satisfy the following formula (1) |n1-n2&verbar