Interference Pigment Mixture for Skin Tone Matching
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Solution Overview
Problem
Existing cosmetic formulations using classical absorption pigments struggle to provide a uniform and desired skin hue without masking the natural appearance, as they require multiple complementary color pairs that limit color intensity and setting options.
Innovation Solution
A pigment mixture comprising two or three interference pigments with specific CIE L*a*b* color values (red, blue, and green) allows for a wide range of hue and intensity settings, enabling individualized skin tone matching by mixing these pigments in various ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If four interference pigments in the form of two complementary red-green and blue-yellow colour pairs are used, then the colour range for use on the skin is covered, but the colour of the formulation cannot be set freely as desired and mutual colour extinction makes setting a particular colour and colour intensity very difficult or even impossible
Solution Approach 1:
The patent extracts and eliminates the yellow component from the traditional complementary color pairs, using only red, green, and blue interference pigments. This removal of the yellow pigment allows for independent color adjustment without the constraint of maintaining complementary pair relationships, thereby enabling free color setting while still covering the necessary skin tone range.
Solution Approach 2:
The patent segments the color system into three independent interference pigments (red, green, blue) with specific CIE L*a*b* value ranges, allowing each pigment to be adjusted independently. This segmentation enables flexible color formulation by mixing these three base pigments in various proportions to achieve desired skin tone matches without the mutual extinction problems of complementary pairs.
2Adaptability or versatility
If classical absorption pigments are used, then skin irregularities can be covered, but the skin appearance is hidden in the manner of a mask and brightness is impaired
Solution Approach 1:
The patent employs interference pigments that utilize optical interference effects to produce color changes based on light wavelength and viewing angle. These pigments reflect specific wavelengths while allowing other light to pass through or scatter, creating a luminous effect that covers skin irregularities without the masking effect of traditional absorption pigments, thereby maintaining skin brightness and natural appearance.
Solution Approach 2:
The patent uses interference pigments composed of layered structures (such as metal oxide coatings on substrate particles) that create optical interference effects. This composite material structure enables the pigments to selectively reflect and transmit light, providing coverage while maintaining brightness, unlike classical absorption pigments that simply absorb light across broad spectra.
3Device complexity
If two or three interference pigments with specific CIE L*a*b* values are used, then the number of requisite interference colours is reduced and band width of achievable hues and colour intensities is significantly increased, but requires precise control of pigment mixing ratios
Solution Approach 1:
The patent defines specific CIE L*a*b* value ranges for each of the three interference pigments (red: a≥25, b≥0; green: a≤-15, b≥0; blue: b≤-50), which standardizes their color properties. By controlling the mixing ratios of these standardized pigments, the formulation can precisely achieve desired colors and intensities. The patent provides guidance on mixing ratios to achieve different color effects, facilitating manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the neutralization of skin irregularities with flexible color setting, enhancing the cosmetic formulation's ability to match any skin type without impairing brightness, using interference pigments like mica flakes coated with metal oxides, which are suitable for cosmetics, paints, and other applications.
Implementation Method 1
The present invention relates to a pigment mixture comprising at least two or three interference pigments of different interference colours
Data Source
AI summary
A pigment mixture comprising at least two or three interference pigments of different interference colours selected from the colours red, green and blue, suitable for use in paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glasses and in the preparation of pigment preparations, dry preparations and in particular cosmetic formulations.