Congo Red is an azo dye. It binding been used as a diagnostic test for the presence of amyloid in tissue sections.

Cardiogreen is a low toxicic fluorescent agent, is a tricarbocyanine dye,has been widely used in medical diagnostics, such as determining cardiac output, hepatic function, and liver blood flow, and for ophthalmic angiography.

4-Methylumbelliferyl heptanoate (4-Methylumbelliferyl enanthate) is a lipase fluorescent substrate that detects cell-mediated cytotoxicity and cell proliferation.