To detect and study neutrinos over the course of several years, SNO+ proposes to 'light up' neutrinos in an underground sphere by filling it with 780 tons of a fluorescent cocktail. Our paper examines the degradation of this cocktail over time. In his work, Nic Andrews uses a submersible fiber-probe to measure the fluorescence excitation emission matrix spectrum of the cocktail as it is thermally and oxidatively degraded. (PCCP 19(1) 2017)