Provided is a plasma treatment detection indicator that enables the completion of plasma treatment to be confirmed from the color change of a color-changing layer by controlling the color change rate, regardless of whether the type of plasma is reduced-pressure plasma or atmospheric-pressure plasma, and regardless of the degree of plasma intensity； also provided is an ink composition for detecting plasma treatment for forming the color-changing layer.The ink composition for detecting plasma treatment comprises an organic dye and at least one member selected from the group consisting of a photopolymerization initiator, silica, and hydrophobic alumina.
