2007 Volume 80 Issue 5 Pages 193-198
Makeup products, especially foundation products, are aimed to achieve an ideal complexion by concealing the defects on the face, such as black spots and dullness.
In this study, an attempt was made to recover the reflectance spectral curve of the complexion exposed to various damaging external stimuli such as ultraviolet rays by using color and optical control. Reflectance spectra were used for the evaluation of the skin color ; this method has been widely used in the cosmetics industry. The spectral reflectance curve of the skin changed such that the lightness decreased in the wavelength range of 400 to 700 nm, and the waveform shape flattened simultaneously.
The characteristics of the spectral curves of 133 types of interference pigments were measured by acquiring their spectral reflectance curves. It was found that carmine-dyed titanium-dioxide-coated mica, which is an interference pigment, induced ruggedness and simultaneously increased the lightness of the spectral reflectance curve. Later, this carmine-dyed titanium-dioxide-coated mica was used in the preparation of cosmetic products. The above mentioned property was also evaluated by conducting sensory evaluations on human subjects.
