This is an abrasive disk, rotating at 1500 rpm. When I shine my flashlight at it, it carries the glow with it, approximately halfway around the disk. What am I seeing happen here?
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I’m guessing it’s an aluminum oxide abrasive? The abrasive is flourescing due to the little bit of uv coming out of the LEDs.
You might find this interesting, if you are grinding iron or steel then the grinding surface may not flouresce due to the iron bonding with the aluminum oxide.
It sounds like you got the answer to your question, so I need to ask, what the heck weird kind of flashlight is that?
It’s a cheap LED pen light, they hand them out like candy where I work. Most of us have our own flashlights anymore.
What effect are you talking about? Is there a frog clinging to the underside of that stone, and you try to coax him out with a flash light?