Dyes diffuse rapidly in water, producing a vivid, easy-to-see color. Excellent for identifying diffusion and dispersion patterns, rates of flow, discharge locations, seepage areas, sea marking, and more.
Fluorescent yellow/green dye (fluorescein) works best in silt-filled waters. Use an ultraviolet lamp (order separately below) to trace fluorescent red or yellow/green dyes where normal visual detection is difficult. Minimum detectable concentration of all dyes in clear water is 1 ppm.