Nurofen Tablets

Why is black stuff in dissolved tablets attracted to magnet accidentally near glass?
Please tell me why there are little bits of black stuff in my glass when I dissolve my tablets so I don't have to swallow them

I bought the Nurofen Express 512mg tablets in Cyprus when I was there on holiday. When I wanted to use this tablet (solid material, almost like a sphere) it was really hard to swallow it, I stuck in my throat. Then when I came home, I tried to use it again, it stuck in my throat again, it has a surface that gets sticky when it gets wet. I tried to drink more water on it but the water jammed, too (blocked by the tablet in my throat), so I vomited it. Its still on my kitchen wall, I will have to repaint it someday. I tried it a third time in the bathroom, and failed to swallow it again. After that I throw the rest into the trash, and searched on google where share my experience about this poison, ... I mean product.