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Brooker's merocyanine dye is used as solvent polarity indicators. It is used as pH sensors and transition metal cation indicators. This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Brooker's merocyanine dye is a fluorescent dye that has been used in analytical chemistry and fluorescence spectrometry. It is an organic compound that is soluble in water, alcohol, and ether. The complexation of Brooker's merocyanine dye with other molecules or solutes can be determined using fluorescence spectroscopy. This dye binds to the cavity of the molecule and stabilizes the dipole moment, which leads to significant interactions between Brooker's merocyanine dye and molecules or solutes.