Misleadingly used for fluorophores (fluorescent dyes) that label probes and quenchers. See list of dyes and dye selection chart (Biosearch Technologies). Consideration of excitation, emission and absorption spectral relationships between acceptor and donor fluorophores (LightCycler probes), reporter and quencher flurorophores (TaqMan probes) and multiplexing is important and discussed in BHQ Brochure (Biosearch Technologies), Marras SA, 2006, and Singer & Johnson (Promega).