Forensics Cheat Sheet Scioly High Quality -

Add (some turn yellow) and pH paper results. 2. Polymer Identification (Plastics) Memorize common recycling codes & density tests:

| Code | Polymer | Density (g/mL) | Float? (Water) | Burn test | |------|---------|----------------|----------------|------------| | 1 | PETE | 1.38–1.39 | Sinks | Smells sweet | | 2 | HDPE | 0.95–0.97 | Floats | Paraffin smell | | 3 | PVC | 1.30–1.58 | Sinks | Acrid, HCl gas | | 4 | LDPE | 0.92–0.94 | Floats | Paraffin smell | | 5 | PP | 0.90–0.91 | Floats | Clean burning | | 6 | PS | 1.04–1.09 | Sinks (but slow) | Sooty, floral | forensics cheat sheet scioly

Add (PS dissolves; others don’t). 3. Hair & Fiber Analysis | Type | Cuticle pattern | Medulla | Cross-section | Burn test | |------|----------------|---------|---------------|------------| | Human | Imbricate (scaly) | Fragmented/trace | Round/oval | Burns quickly, chemical smell | | Cat | Spinous (petal-like) | Unbroken chain | Round | Burnt hair smell | | Dog | Spinous | Thick, unbroken | Oval | Burnt hair smell | | Cotton | Twisted ribbon | None | Bean/kidney | Burns to ash, paper smell | | Wool | Scaly | None | Round | Burnt hair, self-extinguishes | | Polyester | Smooth | None | Round | Melts, beads, no ash | Add (some turn yellow) and pH paper results