The photophysical and photochemical properties of a bi-thiophene linked 2H-chromene are investigated by femtosecond and nanosecond transient absorption spectroscopy. The spectral characteristics and dynamics of the lowest excited singlet and triplet states are determined. The ring-opening reaction responsible for the photochromism is observed to occur in the S, state with a time constant of about 150 ps in acetonitrile.