> betting purple.) But then you lose, and bet
> big. And then lose again . You bring out
> more cash (or get another marker), bet big,
> and then lose. Then bring out even more
> cash, bet big and lose again, etc.

> Now a tourist doesn't do this.

I've seen non-counters do this many times. The trick is to act like a steamer, as MathProf suggests. You don't have to go over-the-top with it either. Just show some negative emotion and don't look cold and calculating as you reach for more money or more chips.

Regards,
-Ken