A disclosed gloss-providing sheet for providing high gloss to a toner
image on a recording material by being placed on a toner image surface of
the recording material, heated so as to fuse toner, and then separated
from the recording material after the toner is cooled and solidified
includes: a notification portion that changes a visual state thereof when
a temperature of the gloss-providing sheet becomes equal to or lower than
a glass transition temperature of the toner.