Coffee Magic Mug

magic mug
A magic mug is a mug that, when filled with a hot liquid, changes colour. This effect is created by using a special oxidized ink.

coffee
A cup of this drink
These seeds raw, roasted and ground, or processed into a powder that dissolves in hot water
A drink made from the roasted and ground beanlike seeds of a tropical shrub, served hot or iced
a beverage consisting of an infusion of ground coffee beans; "he ordered a cup of coffee"
any of several small trees and shrubs native to the tropical Old World yielding coffee beans
coffee bean: a seed of the coffee tree; ground to make coffee