TUMBLE TO THE CHARACTER COLOR IS CHANGED ACCORDING TO THE TEMPERATURE CHANGE

摘要

A tumbler having changeable character colors according to a temperature change comprises: a material (A1) which is made of a general stainless steel material and enables smooth heat transfer; and a color-changeable paper (A2) of which the blue color is changed into a red color or a green color when the temperature of the material (A1) is increased.