Identify will show you all the magical properties of the item that you are using the spell on, however, it doesn’t show curses. Curses are not magical properties, so while you will know if a set of armor is magical or not, you will not know if it is cursed. This can be pretty fun if the characters do not know this, and they decide to put on the suit of magical armor only for it to be cursed. You could allude to the curse and say that there’s darkness or something about the item you cannot identify, which might make the players prick up their ears and be a bit cautious. However, they can also ignore you entirely and use the cursed item, and 9 times out of 10 there are consequences for that! Now they’ve got to find a way to remove the curse!