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Disodium fluorescein dye is added to conventional ethylene glycol formulas to visually distinguish leaked amounts from other vehicle fluids, and as a marker of type to distinguish it from incompatible types. [21] This dye fluoresces bright green when illuminated by blue or UV light from daylight or testing lamps.
If a leak is suspected in a refrigerator or an air conditioning system, a UV tracer dye can be injected into the system along with the compressor lubricant oil and refrigerant mixture. The system is then run in order to circulate the dye across the piping and components and then the system is examined with a blacklight lamp.
Older, non-commercial fluorescent compounds include umbelliferone, which absorbs in the UV portion of the spectrum and re-emit it in the blue portion of the visible spectrum. A white surface treated with an optical brightener can emit more visible light than that which shines on it, making it appear brighter.
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The dye can also be added to rainwater in environmental testing simulations to aid in locating and analyzing any water leaks, and in Australia and New Zealand as a methylated spirit dye. As fluorescein solution changes its color depending on concentration, [ 27 ] it has been used as a tracer in evaporation experiments.
The inspector will use visible light with adequate intensity (100 foot-candles or 1100 lux is typical) for visible dye penetrant. Ultraviolet (UV-A) radiation of adequate intensity (1,000 micro-watts per centimetre squared is common), along with low ambient light levels (less than 2 foot-candles) for fluorescent penetrant examinations.
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