Near-IR CF® dye free acids are control dyes for studies that involve CF® dye succinimidyl ester conjugated to a4d73786-81ea-96bb-77d4-9ff261b5ff15, protein or peptides. CF® dyes are 9689c5aa-6556-4b3c-b5d1-1e693715ba07'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.