First, open the npc Arnold Grissom and place a weapon or armor to refine.
Second, trade a friend.
Third, press'' ç'' twice, note that the item in the inventory changes color.
Fourth, confirm the trade and then close the refinery.
Both will get the item, but only the item that was passed in the trade is the real, what stays with you is false and can not be placed in the auction and not be passed in trade.
Hopefully someone more qualified can take advantage of it and be able to duplicate real.
Thanks for read