Uranin Green

This UV fluorescent dye is easily visible even to the naked eye, which is why it is often used for marking waters. Greatly diluted, the highly water-soluble uranine powder is toxicologically harmless and ideally suited for all leak detections and tightness tests requiring the dyed water to penetrate capillaries. Therefore the leak becomes apparent with a clear time lag to the dye addition. Even tiny leaks can be rendered visible using a UV lamp.

The pure uranine powder as well as highly concentrated solutions in water have a dark red colour. They do not fluoresce. When further diluted, however, the uranine will dye the water in a yellow-green to green fluorescent colour, depending on the degree of dilution. Irradiation with an ultraviolet lamp makes this effect very clearly visible.

Uranin Blue

Just like Uranin Green, this fluorescent dye emulsion is characterised by its extremely brilliant fluorescence. In contrast to Uranin Green, Uranin Blue is not visible to the naked eye, though. Therefore, Uranin Blue in diluted form is practically invisible on almost all substrates in the visible spectrum.

The combination of an emulsion that is completely free of suspended matter and formaldehyde with particularly brilliant UV excitability makes Uranin Blue our best recommendation for leak detection applications, also allowing for the penetration of mineral construction materials, since due to its extremely small particle size, Uranin Blue is not only characterised by an especially good capillary flow but also by a very intensive blue fluorescence under UV excitation, enabling the time-saving UV examination of large areas. Uranin Blue is not supplied in the form of powder, but as a ready-to-use emulsion which can be diluted in water.

Important: Uranin Green and Uranin Blue must not be used as food colourant!