How would you make the light stronger (to see the yuckies better)?
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“Black lights” give off ultraviolet light that is invisible to human eyes, usually along with some visible blue or purple light. Many bodily fluids contain material that is fluorescent under UV: it absorbs the short wave lengths of ultraviolet and then gives off light in the visible spectrum.
You can make a stronger ultraviolet lamp just like you can make a stronger flashlight, but then there’s more risk to humans from more UV exposure.
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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.
As a side note, don’t get too grossed out at first glance… Not everything will necessarily be a bodily fluid:
Biological stains: saliva, semen, urine and blood
Laundry stains: dried liquid detergents
Club soda and all liquids containing quinine
Invisible ink made from lemon juice or similar compounds
Toothpaste with whiteners that fluoresce
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