Hiding with Harry

In Harry Potter and the Sorcerer's Stone, dragon blood is revealed to be an effective oven cleaner (I just cleaned my oven and wished I had some)
I, like countless millions, loved the Harry Potter series and one of my favorite magical objects was his Cloak of Invisibility which had the power to shield the wearer from sight, and could not be worn out by time or spells. Invisibility cloaks are not a new concept and have appeared in literatue since the days of Brothers Grimm. 

When I read about...