Applications of Blue Light-curing Acrylic Resin to Forensic Sample Preparation and Microtomy

Area of Science:

• Forensic Science
• Materials Science
• Analytical Chemistry

Background:

• Traditional embedding media for trace evidence analysis, such as epoxy resins, require specific handling and may affect analytical results.
• Microtome sectioning of trace evidence is crucial for detailed microscopic examination.
• The development of novel embedding materials is essential for improving forensic laboratory workflows.

Purpose of the Study:

• To evaluate a one-part blue light-curing acrylic resin as an alternative embedding medium for trace evidence.
• To compare the physical properties of the acrylic resin with established epoxy resins.
• To assess the impact of the acrylic resin on infrared spectral analysis of embedded samples.

Main Methods:

• Physical properties (viscosity, clarity, color, hardness, cure speed) of the acrylic resin were measured and compared to epoxy resins.
• Thin sections of paint samples embedded in the acrylic resin were prepared using a microtome.
• Infrared spectroscopy was used to evaluate potential smearing or impregnation effects of the resin on sample spectra.

Main Results:

• The blue light-curing acrylic resin exhibited favorable physical properties suitable for trace evidence embedding and microscopy.
• High-quality thin sections were successfully prepared from samples embedded in the acrylic resin.
• No significant contribution to the infrared spectra from the acrylic resin was observed, indicating minimal interference.

Conclusions:

• The evaluated one-part blue light-curing acrylic resin is a viable and effective embedding medium for forensic trace evidence.
• This resin simplifies the preparation of microscopic samples, including paint chips and fibers.
• The findings suggest a significant improvement in workflow efficiency for forensic trace evidence laboratories.