At high laser pulse excitation energies the fluorescence spectrum of all-trans-1,6-diphenyl-1,3,5-hexatriene, DPH, undergoes distortion that can be modeled as the development of a new bread fluorescence, lambda(max) = 497 nm, which builds up biphotonically with increasing excitation laser pulse power. This phenomenon is observed upon excitation at either 266 or 355 nm in a variety of organic solvents, provided [DPH] and excitation intensity are sufficiently high. Four possible sources for the distortion of the fluorescence spectrum are investigated: (1) excimer emission arising from DPH radical cation/anion pairs, (2) bicimer fluorescence from the encounter of two S-1 states, (3) S-n --> S-1 fluorescence, and (4) self-absorption due to overlap of the fluorescence with transient absorption spectra. The first three possibilities are ruled out. The fourth is viable, revealing an effective transient absorption spectrum that agrees well with the known S-n <-- S-1 absorption spectrum at long wavelengths.