It has been shown that simultaneous measurements of reflected light intensity (RLI) with DSC can give additional and valuable information for the thermal analysis of materials including pure organic and inorganic chemicals, natural and synthetic polymers and foods. This paper extends the range of polymers studied and examines the possibility of improving the reproducibility and quantitative nature of RLI measurements. Polymer crystallisation, the curing of epoxy resins, the action of fire retardant additives and the degradation of polymers and proteins are among the systems studied.