Color-change ink compositions for pattern reveal
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Solution Overview
Problem
Existing color-change systems for art and craft applications are messy, difficult to produce, and require special paper, with the black topcoat potentially staining users and having a high dye requirement, while also posing skin irritation risks due to pH issues.
Innovation Solution
A marker-paper image reveal system using printing inks with different dye combinations that react with a color-change agent to change from a single starting color to multiple primary colors, eliminating the need for a messy black topcoat and allowing use on any paper type, with a pH-adjusted color-change agent composition to ensure skin safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thick black opaque coating layer is used to provide opacity and cover printed designs, then the opacity and coverage are improved, but the coating becomes messy to use, stains users' hands, and requires a great deal of dye
Solution Approach 1:
The patent uses color-change ink compositions that appear black or dark when dry but change to different colors (cyan, magenta, yellow) when contacted with a color-change agent. This eliminates the need for a thick opaque black coating while still providing the necessary coverage and visual effect, thereby reducing messiness and dye usage.
Solution Approach 2:
The ink compositions utilize pH-sensitive dye compositions that change color based on pH levels. The color-change agent modifies the pH environment, causing the dyes to transition from a dark state to colored states, achieving opacity and visual effect without requiring excessive dye material.
2Loss of information
If a black topcoat is applied to reveal printed designs, then the design visibility is improved, but the topcoat requires special paper and is difficult to produce
Solution Approach 1:
The system uses color-change ink compositions that react with a color-change agent to reveal underlying printed designs. Multiple ink formulations (black-to-cyan, black-to-magenta, black-to-yellow) are spot-printed in patterns, and when the colorless color-change agent is applied, the inks transform to reveal the design without requiring special paper or complex production processes.
3Reliability
If the pH of the color-change agent composition is increased to enhance color-change effectiveness, then the color-change performance is improved, but the composition may irritate user skin
Solution Approach 1:
The patent carefully controls the pH of the color-change agent composition to balance effectiveness and safety. The pH is adjusted to be greater than 6 and less than 14, optimizing the color-change reaction while maintaining skin safety. This parameter optimization ensures reliable color transformation without causing skin irritation.
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 system effectively changes color upon contact with the color-change agent, revealing a multi-colored pattern without the need for a black topcoat, improving usability and safety by maintaining a safe pH range and allowing use on any paper, while reducing mess and dye usage.
Implementation Method 1
Each of the one or more ink compositions comprises a respective i) at least one first dye composition characterized by a respective first color; and ii) at least one second dye composition characterized by a respective second color. When the a) color-change agent composition contacts the b) one or more ink compositions, each respective i) at least one first dye composition reacts with the a) color-change agent composition, thereby producing each respective second color.
Data Source
AI summary
The marking system includes one or more ink compositions and a color-change agent composition. The ink composition applied to a substrate such that it is a first color, but when a color-change agent is applied, one or more secondary colors appear. The ink compositions each have a respective ink color and include a respective: at least one first dye composition having a respective first color and at least one second dye composition having a respective second color. The first dye composition can react with the color-change agent composition. When the color-change agent composition contacts the ink composition, each respective first dye composition reacts with the color-change agent composition, 10 thereby producing each respective second color. Each respective first color is different from each respective second color, and each respective second color is different from each respective ink color.