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Lumogallion (4-Chloro-3-(2,4-dihydroxyphenylazo)-2-hydroxybenzene-1-sulfonic acid) is an azo reagent used in the determination of metal ions, such as the research of V, Fe, and Al.

2,3-Diaminonaphthalene is a highly selective fluorometric and colorimetric reagent for selenium detection, and it is also used for the fluorometric determination of nitrite.

Azomethine-H monosodium (Azomethine H) is a colour-forming reagent and a boron determinations reagent.

Sel-green is a selective selenol fluorescent probe used for quantifying the selenocysteine (Sec) content in the selenoenzyme thioredoxin reductase, as well as imaging endogenous Sec in live HepG2 cells.

CAY10731 is a fluorescent probe for hydrogen sulfide (H2S).[1] Upon reaction with H2S, fluorescein (FITC) is released and its fluorescence can be used to detect H2S. FITC displays excitation emission maxima of 485 535 nm, respectively. CAY10731 is selective for H2S over glutathione (GSH), cysteine, H2O3-, SO3-, and H2O2 as well as tBuO and OH radicals. It has been used to detect H2S in rat hippocampal slices and nematodes.