To test the influence of H2O on LH degradation, we subjected all ligand-exchanged LHs to incubation in the dry environment. All materials stored this way exhibited relative changes of less than 10% in their white light reflectance characteristics (Figures and) and less than 3% in their CAs (Figures and) after 30 days. The limited degradation of these compounds in the dry environment compared to that observed after exposure to the humid environment show that H2O plays an important role in the degradation of these LHs.