Titanium Dioxide Lifting Strip for Bloody Impression Fluorescence
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Solution Overview
Problem
Current methods for lifting bloody impressions from crime scenes, especially from dark-colored surfaces, are limited in effectiveness and require laboratory settings, making it difficult to visualize and preserve impressions on non-porous and semi-porous surfaces.
Innovation Solution
A method using a backing sheet with titanium dioxide, activated with water, methanol, or Kodak Photo-Flo 200, to lift and preserve bloody impressions by creating a fluorescent property under specific lighting, allowing for effective visualization and preservation without the need for laboratory equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical reagents and laboratory procedures are used to enhance bloody impressions, then visualization quality improves, but device complexity and time consumption increase
Solution Approach 1:
The patent extracts the enhancement function from complex laboratory chemical procedures and concentrates it into a single lifting sheet impregnated with titanium dioxide. This allows the bloody impression to be lifted with enhanced visualization capability without requiring laboratory equipment or complex chemical reagent procedures.
Solution Approach 2:
The lifting sheet is designed as a disposable, single-use device that can be easily applied and removed. Each sheet is pre-impregnated with titanium dioxide and can be used once to lift and enhance a bloody impression, then discarded, eliminating the need for complex laboratory procedures and equipment.
2Measurement precision
If chemical reagents and laboratory procedures are used to enhance bloody impressions, then visualization quality improves, but time consumption increases
Solution Approach 1:
The lifting sheets are pre-impregnated with titanium dioxide during manufacturing, so that when needed at the crime scene, they are ready for immediate use. This preliminary preparation eliminates the time-consuming step of preparing chemical reagents and laboratory procedures on-site.
Solution Approach 2:
The patent extracts the enhancement function from complex laboratory chemical procedures and concentrates it into a single lifting sheet impregnated with titanium dioxide. This allows the bloody impression to be lifted with enhanced visualization capability without requiring laboratory equipment or complex chemical reagent procedures.
3Illumination intensity
If traditional lifting methods are used on dark colored surfaces, then contrast is insufficient, but using chemical reagents increases procedure complexity
Solution Approach 1:
The lifting sheet utilizes titanium dioxide, a white pigment, to create high contrast against dark surfaces. When the bloody impression is lifted onto the white background of the lifting sheet, the contrast is dramatically improved, allowing for clear visualization of ridge structures even on dark colored surfaces.
Solution Approach 2:
The patent extracts the enhancement function from complex laboratory chemical procedures and concentrates it into a single lifting sheet impregnated with titanium dioxide. This allows the bloody impression to be lifted with enhanced visualization capability without requiring laboratory equipment or complex chemical reagent procedures.
4Illumination intensity
If bloody impressions are photographed directly on dark surfaces, then contrast is insufficient, but enhancement procedures require laboratory settings
Solution Approach 1:
The patent extracts the enhancement function from complex laboratory chemical procedures and concentrates it into a single lifting sheet impregnated with titanium dioxide. This allows the bloody impression to be lifted with enhanced visualization capability without requiring laboratory equipment or complex chemical reagent procedures.
Solution Approach 2:
The lifting sheet is designed as a disposable, single-use device that can be easily applied and removed. Each sheet is pre-impregnated with titanium dioxide and can be used once to lift and enhance a bloody impression, then discarded, eliminating the need for complex laboratory procedures and equipment.
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 successfully lifts and preserves bloody fingerprints from non-porous and semi-porous surfaces, providing excellent visualization of ridge structures and allowing for easy removal and analysis of impressions from crime scenes without laboratory equipment, enhancing the forensic science process.
Implementation Method 1
The impression so lifted will have fluorescent properties when viewed with a predetermined type of lighting such as ALS
Implementation Method 2
applying a liquid to the sheet to wet the titanium dioxide
Implementation Method 3
applying a liquid to the sheet to wet the titanium dioxide
Implementation Method 4
lifting the backing sheet to remove at least an identifiable portion of the impression from the surface
Data Source
AI summary
A fluorogenic lifting strip containing titanium dioxide has been successful in the lifting and enhancement of impressions and bloody impressions from nonporous, semi porous and porous surfaces. The lifting strip is best when activated with an alcohol such as ethanol or methanol. When the lifting strip has dried after application it can easily be removed from the surface lifting the impression onto a contrasting white background. The lifting trip can be subsequently visualized with an ALS or Laser to fluoresce the lifted impression with optimal contrast for visualization and examination. This method is safe, easy, and effective on several surfaces of contrasting colors.