

Bottle caps are stored in big bags of some sort before being placed on bottles.
They have sharp edges and they scratch each other’s paint as they shift around in the bags.
The scratching produces a fine dust of plastic/paint particles. The dust covers all sides of the bottle caps in the bags.
The caps are placed on the bottles. The dust goes into the liquid inside the bottle. People drink it.
I’m all for the “SLEEP 8 HOURS” bit though. I need more of that in my life.