Provided are novel hetero-polycyclic compounds having a specific
structure, color-changing material compositions comprising (A) a
fluorescent coloring matter comprising at least one of the
hetero-polycyclic compounds described above and (B) a binder material,
color-changing films comprising the above hetero-polycyclic compounds,
coloring matters comprising the above hetero-polycyclic compounds, and
pigments or dyes comprising the hetero-polycyclic compounds described
above, and provided are color-changing material compositions which are
not deteriorated in a color-changing performance even after used for long
time and which are prevented from being unusable due to deposition of
coloring matters during storage and color-changing films produced by
using the same, and novel hetero-polycyclic compounds, coloring matters
and pigments or dyes which actualize them.