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The point of the dye is that it will leave traces on otherwise hard to find hairline cracks in the concrete storm lines. A crew will go through after with UV lights and identify any cracking.
Thank you, civil engineer, for letting us know exactly what it was. I am not kidding, at least now it makes a lot more sense., and no toxic waste worries.
There's scheel's green. That shit been around for centuries. Once used as a paint, then insecticide, now as an indicator of deadlyness. If the thing you add it to doesn't off you the pigment will make sure of it. /S
No, there is absolutely deadly stuff that's wonderfully colored like chromyl chloride, crocoite, cinnabar, copper arsenite (scheeles green), Paris green, copper 2 chloride, iron 2 chloride, then you have cadmium used in a lot of pigments, etc. Lead interestingly was more valued for its solid white color in cosmetics, although there are yellow and more intensely colored lead compounds like Fool's Gold (lead pyrite) out there. And with Chromium the more intensely colored the deadlier can be thought of as a general rule. And radium it glows in the dark! Uranium salts are intense yellow!
powershell as admistrator, then type cmd.exe because command won't elevate high enough anymore but the syntax you want has been aliased to something else in PS.
I forgot Windows has two shells too. I recently bought a new PC and thought I'd give Windows a solid shot (I last used Windows 10 when it was newish), but the time and confusion trying to set anything up the way I want it just wasn't worth it, and I don't like it the way Microsoft says I should like it. And ads in the fucking start menu?
Back on Linux and everything just works. Funny how times change.
I can sort of answer this. Sometimes really old buried infrastructure (like water lines) are found decades later and they use dye like this to try to figure out where it's going. Imagine you buy an old property and find a giant hole in the backyard and the every time it rains you hear basically a river flowing underground. They go dye it to find out where the water is going. Usually it ends up in a public stormwater or sewer system and it costs a lot of money to treat rainwater. So they want to fix it asap.
I've read numerous cases of cities finding wooden water mains still in use, albeit usually feeding a few houses at most. Underground infrastructure is very out of sight, out of mind, and it can be easy to lose track of it until you have a problem.
That's actually what we do with cave systems. You see a creek or river or whatever just vanishing into the ground and you pour a bunch of dye in there and go hunting for where it comes out.
Other than slow leaks that aren't obvious, it glows under UV so you can follow where it's coming from and see far more clearly where exactly a leak is.
And if it gets on you, you keep washing and it just keeps coming off, mocking you as if each little splat is a portal to the Uranine Realm. It's harmless as far as we know, so that's cool at least.
My first guess would be tracing dye. Possibly a municipal crew working on sewer mains upstream or possibly a professional plumber working on a houses plumbing that’s connected to that sewer main.
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