An analysis of colored substances diffusion in а plane liquid layer by means of digital photography

A procedure for measuring of colored substances concentration distributed in plane liquid layer has been presented. The technique is based on the digital photography and following processing of its results. A linear model of diffusion in horizontal layer was proposed and identified on the base of measurement results. The process is not purely diffusive since it has oscillating modes caused by convection. We develop a new measurement method of colored substances diffusivity in liquids.