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Forensic Analysis of Glass

Forensic Examination of Glass. Goals in examining glass evidence:Determine the types of glass at the sceneDetermine how the glass was fracturedUse physical characteristics to classify itIndividualize the glass to a sourceCompare physical and chemical characteristics:Optical properties: color and refractive indexNon-optical properties: surface wear, striations from manufacturing, thickness, surface film or dirt, hardness, densityChemical properties: additives or trace elements.

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Forensic Analysis of Glass

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    2. Forensic Examination of Glass

    3. What is Glass?

    4. What Types of Glass Are There?

    5. What Types of Glass Are There?

    6. How Do Glass Windows Break?

    7. How Does Glass Break?

    8. How Does Glass Break?

    9. Exceptions to the Three R Rule

    10. Types of Fractures by Projectiles

    11. Which side was the bullet fired from?

    12. Which Bullet Hole Was First?

    13. Putting it Back Together Again?

    14. Learning Check

    15. Glass Transfer Evidence

    16. Collection of Glass Samples

    17. Forensic Examination of Glass

    18. Optical Properties of Glass

    19. Nonoptical Physical Properties of Glass

    22. Why Measure Density? Can be used as a screening technique with large numbers of fragments. Useful in identifying multiple sources present in the known and/or questioned samples. It is nondestructive and an intensive property (not dependant on sample mass). Need to measure very precisely in parts per hundred or thousand or better.

    23. Glass Density

    24. Density by the Flotation Method

    25. Why Measure Refractive Index?

    26. Snell’s Law

    28. Refractive Index By Immersion

    33. Chemical Analysis of Glass

    34. Learning Check

    36. The Wave of the Future: Laser Ablation

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