Fura Red, AM is a visible light-excitable fura-2 analogue that When used with a single excitation wavelength green fluorescent calcium indicator, it offers unique possibilities for Ca²⁺ ion ratio measurement in single cells by microphotometry, imaging or flow cytometry. . This acetoxymethyl (AM) ester form is available for non-invasive intracellular loading and is also available in a 1 mg grade (F-3020).