In the Batman: The Animated Series episode "Heart of Ice", Mr. Freeze shoots what seems to be ice from his freeze gun, but is it ice or something else?
When Mr. Freeze "freezes" the legs of one of his henchmen, they are forced to leave him, but Batman rescues him using a chemical bath. If it was just ice, why couldn't Batman just wait for it to melt?
Mr. Freeze traps Batman with the "ice" but he punches and kicks his way out. I understand why he didn't want to wait because Mr. Freeze and his henchmen are driving away.