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Fluorescein measurement instruments

Fluorescein is a group of fluorescent tracer dyes that absorb blue light and re-emit this light in the green part of the electromagnetic spectrum. The dye molecules are small enough to be able to diffuse among water molecules to form a solution. They are therefore fully dispersed in the water column and move with the water molecules. Several variations of fluorescein dye exist, and though each results in slightly shifted absorption and emission maxima, the selection of wide excitation and emission filters means that only small changes in signal are detected.