We present a sounding rocket experiment studying the interplay between chemistry and interfacial-tension-driven hydrodynamic instabilities. The system on hand is a combination of two immiscible liquids separated along an initially plane interface at which an interfacial reaction takes place. The reaction leads to an in-situ formation of a surface-active product. This system is studied using an integrated Hele-Shaw cell concept developed in the project. With onset of the microgravity phase four Hele-Shaw cells are filled manually. Basic diagnostic tools are two shadowgraph visualization systems of high resolution and two differential interferometer, each of them containing one cell. The experiment shows an intriguing dynamic interplay between cellular Marangoni convection, thin film dynamics and interfacial deformations.