Forensics Unit 5 Part 1 Notes

Primary ingredient

________ is silicon dioxide SiO2 (quartz mineral or sand) and traces of various metal oxides: sodium, calcium, magnesium, and aluminum oxides.

Cobalt

blue glass

Plastic sheet

________ sandwiched between two regular pieces of glass.

sand mixture

What is heated to extremely high temperatures and cooled rapidly before it can recrystalize? Answer with a single words or term.

SODA

________ (NaCO3): lowers the melting point & viscosity making the glass easier to work with.

fracture

A(n) ________ can not cross an existing fracture.

size of the projectile

The ________ can not be accurately measured from the crater.

Concentric fractures

(________ will be reverse)

Glass

________ is very stable & not susceptible to environmental degradation.

Radial fractures

________ happen first; immediately.

CONCENTRIC FRACTURES

Radial fractures happen first; immediately. circular fractures around the center.

SHEET GLASS

________: blown glass cylinder cut open, unrolled or flattened by gravity and cooled.

Chromium

green tinted glass