Pacific Blue is a member of the group of Pacific dyes, which includes Pacific Orange, Pacific Green, and Pacific Blue. These fluorescent dyes all have an absorption maximum between 400 and 410 nm, but with different emission spectra: this allows simultaneous excitation with one laser, producing emission at maxima of 455 nm, 500 nm and 551 nm, respectively[3] (note: absorption and emission maxima may vary depending on the manufacturer).