FLUORESCENT DYE TRACERS TABLET FWT RED ,products are specially formulated versions of Rhodamine B, one of the traditional fluorescent water tracing and leak detection materials. It may be detected visually, by ultraviolet light and by appropriate fluorometric equipment. Visually the dye appears as a bright dark red to magenta, depending on its concentration and under ultraviolet light as a bright orange. Compared to Bright Dyes FLT Yellow/Green or FLUORESCENT DYE TRACERS TABLET FWT RED products, Industrial Red is significantly less resistant to absorption of inorganic / organic suspended matter. This limits its suitability in many applications, particularly where fluorometric detection is needed. This dye has greater resistance to sunlight than FLT Yellow/Green and is equivalent to FWT Red.