Ice is a scantily explored reaction medium that catalyzes a large number of processes and reactions; some of these, such as bromine explosion and the related ozone layer depletion, have a major impact on the natural environment. Ice in nature hosts many compounds; however, neither their location on ice nor the chemical identity have been sufficiently explained thus far, despite being of essential importance for the compounds' (photo)reactivity. In this project we will examine the compounds' behaviour via optical spectroscopies and environmental electron microscopy.