BHQ染料是真正的暗猝灭剂，由于其多芳基偶氮主链，没有天然发射。取代芳环上的给电子基团和吸电子基团可以产生一系列具有宽吸收曲线的猝灭剂，这些猝灭剂横跨可见光谱到近红外区域。BHQ染料通过FRET和静态猝灭的组合工作，使研究人员能够避免荧光猝灭剂（如TAMRA）常见的残留背景信号或低信噪比。 BHQ-1 amine is an excellent building block for labeling carbonyl-containing molecules. BHQ-1 dyes are nearly non-fluorescent with moderate extinction coefficients. These dark quenchers are most typically used in Molecular Beacon probes in which FRET has minimal contribution to their fluorescence quenching, thus dependence on donor-acceptor spectral overlap is not significant as to other FRET probes such as FRET peptides. BHQ-1 dyes can quench a variety of fluorophores, in particular, fluorescein derivatives such as FAM, HEX, TET, NED and JOE. This may reflect the BHQ-1's ability to form stable, non-fluorescent complexes with a fluorophore.