Discrimination medium and discrimination method therefor

A discrimination method for a discrimination medium comprising an optical functional layer including thermochromic or photochromic material and a color shifting layer mounted on the optical functional layer, the method comprising:

• a step without heating or irradiating of light on the discrimination medium;
• and
• a step including heating or irradiating of light on the discrimination medium;
• or
• a step for changing the optical functional layer to show light absorbability or maintaining the state thereof;
• and
• a step for changing the optical functional layer to show light transparency or maintaining the state thereof.

A discrimination method for a discrimination medium comprising an optical functional layer including thermochromic or photochromic material and a color shifting layer mounted on the optical functional layer, the method comprising:

• a first step for detecting light reflected from the discrimination medium at a first temperature or without irradiating of light;
• a second step for detecting light reflected from the discrimination medium at a second temperature which is higher than the first temperature or with irradiating of light;
• and
• a step for determining an authenticity process with reference to the first step detecting reflected light and the second step detecting reflected light.