PROBLEM TO BE SOLVED: To provide an evaluation method for predicting coming-off of makeup caused by sebum without imposing a heavy burden on a subject and recommending a cosmetic material that reduces the coming-off of makeup for the subject.SOLUTION: An evaluation method for coming-off of makeup obtains a scattering coefficient, an absorption coefficient, and a refractive index of a cosmetic material, or optical data convertible thereto, with respect to a plurality of states having different addition amounts of oily components in the cosmetic material, and obtains a spectral reflectivity of a bare skin. The method evaluates the coming-off of makeup by calculating and comparing the spectral reflectivity of a skin to which the cosmetic material has been applied when a coated film of the cosmetic material is formed on the bare skin in a predetermined coating amount, for each addition amount of oily components in the coated film of the cosmetic material, by using an estimation equation for estimating the spectral reflectivity of the skin to which the cosmetic material has been applied through the use of the scattering coefficient, the absorption coefficient, the refractive index, the coating amount of the cosmetic material and the spectral reflectivity of the bare skin, or the optical data convertible thereto, based on an optical model in a state of lamination of the bare skin layer and the coated film of the cosmetic material.COPYRIGHT: (C)2013,JPO&INPIT【課題】被験者に大きな負担をかけることなく、皮脂による化粧崩れを予測し、被験者にとって化粧崩れの少ない化粧料を推奨できるようにする。【解決手段】化粧料の散乱係数、吸収係数及び屈折率、又はこれらに変換可能な光学データを、該化粧料中の油性成分添加量が異なる複数の状態について取得すると共に、素肌の分光反射率を取得し、素肌層と化粧料塗膜との積層状態の光学モデルに基づき化粧料の散乱係数、吸収係数、屈折率、塗布量、及び素肌の分光反射率又はこれらに変換可能な光学データを用いて化粧料塗布肌の分光反射率を推定する推定式により、前記素肌上に化粧料塗膜が所定の塗布量で形成されているときの化粧料塗布肌の分光反射率を、該化粧料塗膜中の油性成分添加量ごとに算出して比較することにより化粧崩れを評価する。【選択図】図1
