Blacklight Question

[ArtNJ]

Its been years since I owned one, but I just used one down in my basement and I'm puzzled. I dont remember two different colors. I have some spots that are glowing yellow and look like clear biologic residue of some kind (vomit for most) and I have other spots that are blue but not solid, like blue sparkles or something. Its the blue that is really puzzling me. I did a quick search online, but got a lot of junk results so I was hoping you all can help.

Thanks!

 

[FeebysOwner]

Not sure, but the color difference might relate to previously used cleaners. There are a lot of cleaners on the market that will 'show up' in black light inspections - making it hard to use them to detect just biological matter/residue. Just a guess on my part, though, in explaining the different coloring.

However, this article does seem to indicate some cleaners will highlight as 'blue'.
What Kind of Invisible Stains Do Black Lights Detect?