A new article co-authored by former graduate students John Saunders, Hao Chen, Weijan Chen and undergraduates Chris Brauer and McGregor Clayton, describes the application of a new interferometric refractometer to one of the most ubiquitous polymers, i.e. silicone. In the article we use a new model based on the Lorenz-Lorentz equation to quantify the amount of organic vapours in the PDMS film and can even characterize the polymer restructuring that occurs when a guest molecule enters the polymer.