Chem. Sci., 2026, Accepted Manuscript DOI: 10.1039/D6SC02114J, Edge Article Anam Fatima, Mark H Stockett, Eleanor K Ashworth, Woojin Park, Cheol Choi, Joseph A Wright, Pratip Chakraborty, Partha Malakar, Steve R. Meech, James N Bull The neutral GFP chromophore is the photoactive form in many photoconvertible and photoswitchable fluorescent proteins, yet experimental characterisation of its ultrafast dynamics requires clear assignment of the associated transient signals....