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Always measure from the starting line to the center of the pigment spot. Glass Analysis
Physical characteristics under a microscope or during a burn test are your best clues. Plastics (Resin Codes) Sinks in water. HDPE (2): Floats in water. PVC (3): Sinks in water; green flame in copper wire test. LDPE (4): Floats in water. PP (5): Floats in water. PS (6): Sinks in water; dissolves in acetone.
Add (PS dissolves; others don’t).
Fizzes violently with Vinegar (CO2). Sodium Carbonate: Fizzes with Vinegar; pH ~10-11. Calcium Carbonate: Fizzes with Vinegar; insoluble in water. Cornstarch: Turns black/purple with Iodine.
Radial (points toward thumb) and Ulnar (points toward pinky). Whorls: Plain, Central Pocket, Double Loop, and Accidental. Blood Typing Type A: Agglutinates with Anti-A. Type B: Agglutinates with Anti-B. Type AB: Agglutinates with both. Type O: Agglutinates with neither. Binder Tips for Success
Distinct crystalline shape; pH neutral. Liquid Reagents Iodine: Tests for starch (turns black). Vinegar (HCl/Acetic Acid): Tests for carbonates (fizzing).
