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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