Study of foundation tone after application to the skin. (I). Estimation of change in foundation tone after application to the skin.:Estimation of change in foundation tone after application to the skin
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概要
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The tone of makeup products such as foundation (applied color) appears to change after application to the skin. It is well-known that the extent of this change is very difficult to determine before application. Carrently, proper color balance can be achieved only by visual judgment or quantitative color measurement after such products have been applied to the skin. Previously, we reported a method for estimating the reflectance of applied color based on the Kubelka-Munk theory. However, it is not easy to construct the data base needed for estimating the reflectance of applied color. In addition, we found that applied color could not be estimated using this method in some cases.We therefore reviewed the methodology and procedure used to estimate applied color in an attempt to solve the problems that arose after our last report. In the present report, in addition to predicting changes in foundation tone when applied over normal skin, we examined whether or not this method is applicable to cases in which foundation is applied over blue-black moles (nevus of Ota) or red moles (port wine stain).Four improvements were made in the procedure. These included: 1) development of a printing machine that enables highly reproducible printing of the foundation coat; 2) modification of the method used to obtain the reflectivity; 3) introduction a software technique that clarifies the relationship between estimated value and the level of the set points K1 and K2 in Saunderson's correction formula; 4) introduction of a state-of-the-art laser instrument for measuring the thickness of the foundation coat. Further, using these modifications and improvements, it was confirmed that foundation tone can be estimated for normal skin as well as for the site of moles.
- 日本化粧品技術者会の論文
日本化粧品技術者会 | 論文
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