How do you make an object that only becomes visible on UF light?

As an example, fingerprints or in the game Phasmophobia there are such objects

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You can create an invisible part that represents the area where the light is stronger which makes the fingerprints appear.
Like this:

script.Parent.Touched:Connect(function(hit)
	if hit.Name == "fingerPrint" then --Cheks if the hit is a fingerPrint
		hit.Transparency = 0 --Shows the fingerPrint
	end
end)

Of course the code changes if you are using a tool for the light or a model for the fingerPrint.

Not really, Iā€™d like a Phasmophobia-like appearance so that you can see ONLY when exposed to light