The harry potter colour change glass is a themed goblet decorated with an image of hogwarts school of witchcraft and wizardrys coat of arms featuring the four house mascots gryffindors lion hufflepuffs badger ravenclaws eagle and slytherins snake when the glass is cold the crest is a black and white image but when filled with a hot drink the rich colours appear before your eyes features harry potter colour change glass designed with hogwarts crest and motto image is black a