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That's a good idea, yeah. But then you can only tell you hit something, not what you have touched. It is more discreet, yes. The paint is just a way to show it to several people, if we ever wanted solid proof.

Lets compromise and send third rocket with paint? ;)

This is why I probably shouldn't try making a lot of money, I'd end up spending it in stuff like this :p

That other part is about how I would tell people.