When is it appropriate to /blackspot a greenie?
If you’ve warned the greenie that their behaviour is inappropriate, and they persist, it is acceptable to /blackspot them. You may not wish to do so, and there is definitely something to be said for the “carrot instead of the stick” approach to teaching, but the tool is there for your use if their behaviour warrants it. Always explain to the greenie why they have been blackspotted; often the behaviour is just a lack of familiarity with Puzzle Pirates standards of behaviour. Remember that this is the first impression the greenie will have of the game.