Advances in material design has also contributed to improved batteries lifetimes. More stable anthraquinone anolytes have been designed, such as 2,6-di(3phosphenopropyloxy)anthraquinone (2,6-DPPAQ), which has a capacity fade rate of <0.014% per day. In 2,6-DPPAQ, phosphonate functional groups replace the hydroxyl functional groups of 2,6-DHAQ, affording both enhanced solubility and chemical stability. However, the impact of electrolyte crossover in operating redox flow batteries remains relatively unexplored. Notably, the impact of crossover on electrolyte stability has not yet been directly measured in any system. This is of particular importance in anthraquinone/ferrocyanide batteries, where the stability of the ferrocyanide electrolyte is already under debate. Though significant research has been carried out to develop compatible organic catholytes, it is an ongoing challenge in the field, and ferrocyanide catholytes remains heavily relied on. As anolyte design progresses, the lifetime of these batteries becomes increasingly dependent on the impacts of crossover and ferrocyanide stability.