Is there a method in VBA, where when in excel I copy a cell's value it triggers my function?

Or any work-arounds for that?

Or can I read key-downs and listen to Ctrl+C ?

Or can VBA read the content of copied text?

The reason is: I copy some entries from an Excel sheet to another program, and i would like to add automatically for example a gray font color to all entries which are already copied.