Freeze the pencil first in the refrigerator for a while, the pencil will turn black, then hold the thermochromic pencil tightly in your hand, as the temperature of the hand is transferred to the pen, the pencil holder will turn a bright color. Our changing pencils can magically change from the black base color to another bright color to reflect your mood, bring you fun in the process of use. The color changing pencil is smooth in writing, can be applied in the school, in the office and at home, which is suitable for writing, painting, sketching and daily use.