pittacal
/ˈpɪtəkl/ /ˈpɪtəkal/Chemistry (now chiefly historical )
noun
A dark blue colouring matter obtained by Reichenbach as a high-boiling fraction in the fractional distillation of wood-tar.
Origin
Mid 19th century; earliest use found in Records of General Science. From German Pittakall from ancient Greek πίττα pitch + κάλλος beauty.