Becoming Invisible

Notes:
One thing is immediately obvious with this spell: the ingredients are relatively easy to come across, almost any desert and a general store will provide what one needs (assuming, of course, one has access to a magic wand and the store has the very seasonal toad spittle in stock). It would seem, therefore, that this spell is too good to be true, allowing one to move unnoticed amongst friend or foe, spy on lovers or would-be lovers, steam from the rich and give to the poor, or vice versa, sneak out of the castle for a midnigt tryst, or anything else ones heated imagination might devise.