Hair Coloring Method Using Diluted Composition for Root-to-Tip Transition
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Solution Overview
Problem
Current retail hair coloring products fail to provide a homogenous color result from roots to tips, often resulting in over-deposition of color, brassiness, and poor adhesion, especially for consumers who have previously colored their hair, as they require separate compositions and application steps, which are complex and costly.
Innovation Solution
A method involving mixing a developer component with a dye component at a 1:1 ratio to create a non-diluted hair coloring composition, applying a first portion to the roots, and then mixing the remaining portion with a dilutant component at a 2:1 ratio to create a diluted composition for application to the hair lengths and tips, ensuring a natural root-to-tip transition and reduced lightening and dye deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single hair coloring composition is applied to both roots and entire hair length, then the application process is simplified, but the color result becomes non-homogenous with over-deposition at tips and poor adhesion at roots
Solution Approach 1:
The invention segments the hair coloring process into two distinct phases: a first coloring composition applied to roots and a second coloring composition applied to the entire hair length. This segmentation allows each composition to be optimized for its specific application area, achieving both homogeneous color results and simplified consumer application compared to traditional salon methods that require multiple separate products.
2Manufacturing precision
If separate compositions are used for roots and entire hair length, then color homogeneity is improved, but product complexity and cost increase
Solution Approach 1:
The invention creates a universal coloring system where two compositions work together in a sequential process. The first composition targets roots while the second composition treats the entire hair length, including previously colored areas. This multi-functional approach achieves salon-quality homogeneous color results through a simplified two-step process that consumers can easily follow without requiring multiple separate specialized products.
3Ease of operation
If a single composition is applied to entire hair length including roots, then application steps are reduced, but adhesion to roots and pull-through to tips becomes poor
Solution Approach 1:
The invention applies preliminary action by treating the roots first with a specifically formulated composition designed to adhere to and color virgin hair. After this initial root treatment, the second composition is applied to the entire hair length, ensuring proper pull-through to the tips. This sequential preliminary action guarantees reliable color adhesion at roots and even distribution throughout the hair, achieving consistent results without requiring consumers to master complex application techniques.
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 method preserves a natural root-to-tip transition, reduces the risk of over-coloring, and achieves a more homogenous, vibrant, and less intensive color result, similar to professional salon treatments, while simplifying the application process and minimizing product complexity.
Implementation Method 1
the developer component comprises an oxidizing agent and the dye component comprises at least one oxidative dye precursor
Implementation Method 2
the dye component comprises at least one oxidative dye precursor and/or an alkalising agent
Data Source
AI summary
The present invention relates to a method for colouring hair wherein a hair colouring composition is applied to the hair roots. The hair colouring composition is then diluted with a dilutant component and the diluted hair colouring composition is applied to the hair lengths and tips.