I have a good idea about this situation. Its got a little history so I'll tell it like it happened.
First, I hate loosing tools, I loose as many as I find though.
So I decided to paint my scrapping tools with some fluorescent spray paint to make them easyer to find.
Since I was doing some of my work in the dark (don't ask) scrapping out a huge pile of wrecked cars it helped a lot, its easy to just put down a tool & forget where I left it once I'd moved on to another car.
Then one day I brought some UV LEDS to use in a light show I was putting together, about then I relised I have some 'Fluorescent carpenters stringline chalk'.
Like this
So I dropped a pinch of the dust on the floor & turned the UV light on... WOW!!!!!
That stuffs amazing under a UV light, you see every tiny speck, even after vacuuming it up I could still see the left over specks in the dark.
Thats when I decided to use the UV light in the dark to find my tools, saved heaps of time.
So, what I suggest, every now & again, drop some UV chalk dust onto your scrapmetal, a pinch or two will do.
Or even set up a trap that contains the chaulk dust. Once someones got some of it on them, all you need is a UV LED torch to find it.
Wherever the scrapmetal, or the person, goes, they will leave a trail of evidence, irrefutable evidence, theres no way they can explain their way out of it & they will have no way of knowing either.
Even if the metals been over a scale, it will leave traces of UV dust.
If you suspect someone you know or just want to eliminate them, turn off the light & turn on the UV light.
You can use the flouro chalk, or the flouro spraypaint, or even a flouro highlighter solution as a dye.
Refrigeration engineers also use the dye to find leaks in freezing systems.
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