The Secret of the Magic Hat.

"Fasih" plays in his father's lab, the Attar, which causes a demon to appear. The sprite burns, leaving a powder that hides what falls on it. A taqiyya is exposed to this powder and acquires a property that hides the one who wears it. Asfour discovers the capabilities of the trap, and uses it, but his enemy discovers the secret, and begins using Cap is against him