This labeling kit comprises our superior near-IR amine-reactive CF® dye and other components necessary for carrying out antibody labeling, purification, and filter sterilization. CF® dyes are Biotium's line of next-generation fluorescent dyes with advantages in brightness, photostability, and conjugate specificity compared to other fluorescent dyes. Far-red/near-IR fluorescent CF®680 dye has excitation/emission at 681/698 nm.