The Tavern

If you find a crossbow you know isn't cursed, it's green. Wield it once, and it's gray. If you find a ring of fire you know isn't cursed, it's gray. Wear it once, and it's green.

I also would like to know this. Also, why do uncursed items lose their 'uncursed' when you drop them? So an unidentified, and potentially cursed ring of ice looks the same as an identified uncursed ring of ice on the ground.

I believe the rule is "stuff you know is uncursed is generally green". However, when you know that is a modifier, like +6 ring of slaying, or +0 arbalest, it is gray. It is unfortunate that this is the same colour as "stuff you don't know whether it's cursed or not".

The rule is "does the full item name contain the word 'uncursed'"? Which is unfortunate, because abbreviating that word out (or setting show_uncursed = false) really shouldn't affect the color of the item.

Edit: Fixed. Now it's easy being green. If you want the old behaviour you can do: