How would you make the light stronger (to see the yuckies better)?
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Black lights are able to show bodily fluids by causing the chemicals (phosphorous and some proteins) to luminesce. It’s not always guaranteed though in cases where the area has been cleaned or the level of chemicals are in low quantities.
Different chemicals in the fluids can also react at different levels based on the wavelengths of the light itself.
There are also more powerful lights that emit more UV light resulting in a brighter luminescence.
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