This is a cup I call "Itiko". Don't ask me why? other than it sounded Japanese it's just a (to me) nice sounding name. I've been making these for some years now. I use a glaze I call "black rabbit". It has the characteristics of a hares fur glaze (vertical drag lines) but is made quite differently. Basically it's the iron oxide that is being dragged by gravity when it's melting at 1280 deg. c. that makes the affect.