Development of a New Color Rendering Powder and Its Application to Base Make-up.
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概要
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It is well known that a sintered pigment made from a mixture of titanium oxide and iron oxide by calcining at 700°C or more shows photochromic characteristics. To develop a photochromic powder having new optical characteristics, we synthesized a composite powder made from the mixture of interference-type pearly pigment and iron oxide (0.2 to 0.3 wt%) through sintering process at 900°C. The photochromic powder (hereinafter referred to as "color rendering powder") having new optical characteristics of which brightness and hue can change simultaneously before and after UV-irradiation. This color rendering powder uses the interference light of pearl pigment (specially blue-based color), while the substrate color tone is adjusted to be a yellowish orange color. This can show a tone change (a color difference of at least 15) that has never been available before. These optical characteristics were applied to correct unnatural appearance of skin under various optical environments. A foundation containing this color rendering powder can correct unnatural cosmetics-appearance of heavy covered skin. For example, the foundation can provide a bright and translucent appearance under fluorescent light and a natural and beautiful appearance under bright sunlight. This new color rendering powder can show superior optical characteristics under various light environments. Therefore, this powder is useful as a powder for base make-up application.
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