Natural Dyeing Method Using Iron Salt Complexes for Eyebrows
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Solution Overview
Problem
Existing dye compositions for keratin fibers, such as eyelashes and eyebrows, often lack satisfactory intensity, homogeneity, and longevity, especially when using natural dyes based on polyphenols, and are not resistant to washing, perspiration, or sebum.
Innovation Solution
A cosmetic method involving a dyeing composition with neoflavonoids, gallic tannins, and catechetic tannins, combined with an oxidant pretreatment and a revealing composition containing iron salts like iron gluconate, along with penetration boosters like dimethyl isosorbide, to enhance color penetration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If natural dyes based on polyphenols are used for dyeing keratin fibers, then environmental sustainability and gentleness to fibers are improved, but color intensity, homogeneity, and longevity deteriorate
Solution Approach 1:
The patent introduces iron salts (Fe2+ or Fe3+) as intermediary substances that form coordination complexes with polyphenol dyes. This intermediary mechanism transforms the weak natural dye into a stable, intense colored complex that binds strongly to keratin fibers, thereby achieving both environmental sustainability and satisfactory color homogeneity and longevity
Solution Approach 2:
The invention creates a composite dyeing system consisting of three components: natural polyphenol dyes, iron salts, and optional organic solvents/penetration boosters. This composite approach combines the environmental benefits of natural dyes with the stability and intensity provided by metal coordination complexes, resolving the contradiction between gentleness and color performance
2Object-affected harmful factors
If natural dyes based on polyphenols are used for dyeing keratin fibers, then environmental sustainability is improved, but color intensity and longevity deteriorate
Solution Approach 1:
Iron salts serve as intermediaries that form stable coordination complexes with polyphenol molecules. These complexes have enhanced stability and binding affinity to keratin fibers compared to free polyphenols, thereby significantly improving color longevity while maintaining the environmental sustainability of using natural dye sources
Solution Approach 2:
The patent modifies the chemical parameters of the natural dye by changing its oxidation state and molecular structure through coordination with iron ions. This parameter change transforms the relatively unstable polyphenol into a stable metal-complex dye that resists fading from washing, perspiration, and sebum, thus achieving long-lasting color while remaining environmentally friendly
3Object-affected harmful factors
If natural dyes based on polyphenols are used for dyeing keratin fibers, then environmental sustainability is improved, but color intensity deteriorates
Solution Approach 1:
The iron salt acts as a mediator that enhances the light-absorbing properties of natural polyphenol dyes. The metal-complex formation creates new electronic transitions that result in deeper, more intense colors, allowing the use of environmentally sustainable natural dyes to achieve color intensity comparable to or exceeding conventional synthetic dyes
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
The method achieves improved color intensity, homogeneity, and longevity on keratin fibers, making the dyeing process more effective and long-lasting while maintaining environmental sustainability.
Implementation Method 1
an oxidant such as hydrogen peroxide produces a slight alteration of the cuticles or scales, outer part of keratin fibres, to open them up and allow the active ingredients to penetrate better
Implementation Method 2
the application onto said keratin fibres of at least: a) A cosmetic dyeing composition A comprising, in a physiologically-acceptable medium, one or more natural dyes selected from the group consisting of neoflavonoids, gallic tannins and catechetic tannins, proanthocyanidins and derivatives of same
Implementation Method 3
b) A revealing cosmetic composition B comprising, in a physiologically-acceptable medium, at least one iron salt and/or aluminum salt, in particular iron gluconate or iron sulphate
Data Source
AI summary
The present invention concerns a cosmetic method for dyeing or making up keratin fibres, in particular eyelashes and/or eyebrows and preferably eyebrows, comprising the application, to the keratin fibres, of at least: a) A dyeing cosmetic composition A comprising, in a physiologically acceptable medium, one or more natural dye(s) chosen from the group consisting of neoflavonoids, gallic tannins and catechic tannins, and/or proanthocyanidins and the derivatives of same and the mixtures thereof, or preferably one or more plant extracts containing same, and advantageously an antioxidant, b) A revealing cosmetic composition B comprising, in a physiologically acceptable medium, at least one iron salt and/or one aluminium salt, in particular an iron gluconate or an iron sulphate, composition A being applied before or after composition B, and preferably before composition B.