The present invention relates to a solid color-changing hydrogel cosmetic composition having flexibility by gamma irradiation, which is an oil-in-water type hydrogel cosmetic composition containing an aqueous phase part and an oil phase part, wherein the aqueous phase Part is 15 to 99.90% by weight of the total composition, and the oil phase part is 0.10 to 85% by weight of the total composition, and the water phase part and the oil phase part are contained. Has a refractive index difference of 0 to 0.02, and is characterized by a color change due to a change in the refractive index difference between the water phase portion and the oil phase portion when applied to the skin when gamma rays are irradiated. The hydrogel cosmetic composition according to the present invention has flexibility by gamma ray irradiation and absorbs water when applied to the skin by using the difference in refractive index between the water phase part and the oil phase part in the composition, and Due to the change in the difference in refractive index due to volatilization, it is possible to visually confirm the optimal application time of the cosmetic composition through the color change from transparent to milky white, and also to suppress the microbial growth of the cosmetic composition to suppress the skin. There is an effect that the quality of the product can be improved without adding an antiseptic agent that causes irritation.本発明は、ガンマ線照射による柔軟性を有する固形の経時的色変化ヒドロゲル化粧料組成物に関し、水相部と油相部とを含む水中油型のヒドロゲル化粧料組成物であって、前記水相部は、組成物総重量％で、１５～９９．９０重量％、前記油相部は、組成物総重量％で、０．１０～８５重量％含有し、前記水相部と前記油相部の屈折率の差は、０～０．０２であり、ガンマ線が照射され、皮膚への適用時、前記水相部と油相部の屈折率の差の変化による色変化を特徴とする。 本発明によるヒドロゲル化粧料組成物は、ガンマ線照射により柔軟性を有すると共に、組成物内の水相部と油相部の屈折率の差を用いて皮膚に適用するとき、水分の吸収度、及び揮発による屈折率の差の変化により、透明から乳白色への色変化を通じて、化粧料組成物の最適な適用時間を目視で確認することができ、また、化粧料の微生物増殖を抑制して、皮膚に刺激となる防腐剤を添加しなくても、製品の品質を向上させることができるという効果がある。
