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Fibers and Threads
Question | Answer |
---|---|
Mineral | earth, glass, asbestos, etc. |
Animal | silk, wool, fur |
Vegetable | cotton, linen, hemp |
Synthetic | rayon, nylon, acetate |
What are some tests that will help to identify a fiber? | burn test, solvent/solubility test, stain test, and microscopic test |
Burn test | burning a fiber can give you hints on its origin; characteristic odors, residues, beading, and smoke/smolder |
Solvent/Solubility test | test to identify if the fiber dissolves in a certain solvent, usually use these solvents: HCL, NaOH, Bleach, Acetone, Dry-cleaning solvent |
Stain test | a test to see if blood stains the cloth, if the blood will bead off, and if it is another substance. |
Microscopic test | a test to see what you can see using the microscope; weave, braids, folds, twists, translucency, fraying, etc. |
Tape method | using tape to collect fiber evidence |
Sweeping/vacuuming method | uses a vacuum to collect fiber evidence, however it collects all the other debris as well. |