We show here that several of these limitations can be overcome by employing elastocapillarity induced deformation as a tool for monitoring the kinetics of a reaction. In essence, we have here tiny cylindrical micro-channels of diameter, ~450 d m embedded inside layers of crosslinked PDMS bonded to a rigid glass substrate. The thickness of these layers, ~460 550 h  m slightly exceeds the diameter of the channel such that a thin skin of minimum thickness, 0 ~10 80 t  m form part of the wall of the channel. When a liquid is inserted into the channel, it alters the solid-liquid interfacial energy leading to bulging deformation of the skin that gets amplified by geometric factor and becomes measurable by optical methods . In our experiment, the liquid is aqueous solution of metallic salts, e.g. Chloroauric acid and Silver