Glass Analysis

Which method is used to individualize glass items in forensic analysis?

• Chemical testing

• Physical fracture matching

• Density determination

• Refractive Index determination

What are the physical properties of glass that can be used as evidence in forensic science?

• malleability, conductivity, and solubility

• color, transparency, and hardness

• density, refractive index, and chemical composition

• odor, taste, and texture

Tags

NGSS.HS-PS2-6

What is the role of boron oxide in glass?

• Reduces transparency

• Increases heat resistance

• Decreases chemical durability

• Increases weight

What will NOT be visible if a glass and a liquid has the same refractive index?

• Conchoidal Lines

• Becke Lines

• Fracture Lines

• Radial Lines

The fracture pattern of glass usually has

• Radial and concentric lines

• Concentric lines

• Radial lines

• Directional lines

In reference to the diagram, line 1 is known as __________, and line 2 is known as ___________.

• Radial and concentric

• Radial and directional

• Concentric and directional

• Concentric and Radial

Which type of glass fractured this way? 

• tempered (auto)

• window

• crystal

• Pyrex

What is the 1st step for handling glass at a crime scene?

• Identify and photograph any glass samples before moving them. 

• Collect the largest fragments that can be reasonably collected

• Identify the outside and inside surface of any glass

• If multiple panes are involved, make a diagram

How can the refractive index of glass be used in forensic analysis?

• By measuring the weight of the glass fragments.

• By analyzing the color of the glass fragments.

• By examining the texture of the glass fragments.

• By comparing the refractive index of glass fragments with known glass samples.

Tags

NGSS.HS-PS4-5

What is the primary component of glass that determines its basic structure?

• Silicon dioxide (SiO2)

• Calcium carbonate (CaCO3)

• Sodium chloride (NaCl)

• Aluminum oxide (Al2O3)

Tags

NGSS.MS-PS1-1