Hair Coloring Method Using pH-Adjusted Compositions for Roots and Tips
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Solution Overview
Problem
Current retail hair color products fail to achieve homogeneous color results due to imprecise instructions and inability to control dye deposition or bleaching, leading to uneven color on hair roots, lengths, and tips, which is not comparable to professional salon results.
Innovation Solution
A method involving two distinct hair color compositions with different pH levels applied to roots and lengths/tips, where the pH of one composition is modified using a pH reducing agent to control dye deposition and achieve distinct color variations, ensuring a smooth transition from roots to tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single retail hair colour product is used on all hair portions, then the application process is simple, but the colour deposition becomes uneven across roots, lengths, and tips
Solution Approach 1:
The hair is divided into three distinct portions (roots, intermediate lengths, and tips) that are treated with different colouring compositions. Each portion receives a tailored treatment based on its specific condition, with roots getting a first composition, intermediate portions getting a second composition, and tips getting a third composition, thereby achieving uniform colour deposition across heterogeneous hair sections
Solution Approach 2:
Different hair portions receive compositions with locally optimized properties. The first composition is formulated for root hair with specific pH and dye content, the second composition for intermediate portions has modified properties, and the third composition for damaged tips has further adjusted characteristics. This local customization ensures each section achieves optimal colour deposition without over-deposition or under-deposition
2Manufacturing precision
If precise control of dye deposition is attempted through multiple compositions, then colour uniformity improves, but the method complexity increases
Solution Approach 1:
The invention controls dye deposition by systematically varying key parameters across three compositions: pH levels are adjusted progressively, dye precursor concentrations are modified for each hair portion, and oxidizing agent strengths are tailored. These parameter changes enable precise control over colour deposition in each hair section while maintaining a systematic approach that doesn't excessively complicate the overall method
3Ease of manufacture
If retail hair colour products are used without professional assistance, then cost is reduced, but the ability to achieve homogeneous colour results deteriorates
Solution Approach 1:
The invention enables home users to achieve salon-quality homogeneous colour results by dividing the hair into three portions and applying different compositions to each. This segmentation approach, combined with clear instructions for each portion, allows consumers to obtain uniform colour deposition without professional assistance, maintaining cost-effectiveness while improving colour homogeneity
Solution Approach 2:
The invention provides locally optimized compositions for different hair portions that can be prepared and applied at home. Each composition is formulated with specific pH, dye concentration, and oxidizing agent levels tailored to the needs of roots, intermediate portions, and tips, enabling consumers to achieve homogeneous colour results without salon intervention
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 allows for a simple, effective way to achieve different color effects on various hair sections without professional assistance, ensuring a significant color variation and improved homogeneity compared to traditional retail products.
Implementation Method 1
The pH of one composition is modified using a pH reducing agent to control dye deposition and achieve distinct color variations
Data Source
AI summary
Method for colouring hair wherein a first hair colouring composition is applied to the hair, e.g. the hair roots and a second hair colouring composition is applied to the hair, e.g. the hair lengths and tips, wherein the pH of the second hair colouring composition is lower than the pH of the first hair colouring composition.