A potion of unholy water (unidentified, a "cursed clear potion" if BUC is known) is the cursed version of the potion of water; it has the inverse effect of holy water: * Dip a blessed object into unholy water to make it uncursed. * Dip an uncursed object into unholy water to make it cursed. * Dip a cursed object into unholy water, and you get message "Interesting..."; the potion is not consumed. Thus, using the #dip command together with unholy water allows you to make cursed objects.