Medium including heat-sensitive medium provided with base material having uneven shape, and adhesive medium bonded to heat-sensitive medium

A medium comprising:

• a heat-sensitive medium subjected to printing by a thermal printer;
• and
• an adhesive medium to be superimposed on the heat-sensitive medium in a thickness direction of the heat-sensitive medium and the adhesive medium and bonded to the heat-sensitive medium,
• the heat-sensitive medium comprising:
• a surface that makes contact with the adhesive medium;
• a heat-sensitive medium base material having a transparency, the heat-sensitive medium base material having a first surface and a second surface opposite the first surface in the thickness direction, the first surface being positioned closer to the surface of the heat-sensitive medium than the second surface is to the surface of the heat-sensitive medium, the heat-sensitive medium base material having an uneven shape having roughness greater than that of the surface of the heat-sensitive medium;
• and
• a first color producing layer provided closer to the first surface than. to the second surface of the heat-sensitive medium base material, the first color producing layer having a transparency, the first color producing layer being configured to become less transparent and to produce a first color when heated to a temperature higher than or equal to a first temperature,
• the adhesive medium comprising:
• an adhesive medium base material;
• and
• an adhesive layer provided on the adhesive medium base material, the adhesive layer making contact with the surface of the heat-sensitive medium so that the adhesive medium is bonded to the heat-sensitive medium.