| abstract |
An indicator including a color-changing layer (A) which has a porous film having pores therein and a liquid compound retained in the pores, and a substrate layer (B) having a barrier property, which are laminated with the first adhesive layer (D), in which the liquid compound has a vapor pressure of from 1 x 10-6 to 5 x10-3 mmHg at 25 DEG C, and the porous film contains a polyolefin resin containing 10% by weight or more of polyolefin having a molecular chain length of at least 2850 nm. |