FSC239Y5 Lecture Notes - Lecture 8: Iodine, Fingerprint Powder, Soot
Document Summary
Fsc239 lecture 08: fingerprint development techniques (guest speaker) Use powder (granular fingerprint powder mainly used) Use tape to lift and transfer to other surface (backing cards: magnetic. Put in oven 100 degrees c for 10 minutes. Can be viewed with forensic light source. Some fingerprints may show up pink: ninhydrin. Requires heat in elevated humidities 65-75% humidity. Does not require any other visualization light source. Can be processed with zinc chloride, but not really required. Will result in purple colour appearing: indanedione zinc chloride. Use lighting to enhance the prints (fluoresce) Requires a heat press (160 degrees for 15 seconds) Pinkish tone to the colour of prints: casting 3d. Get the 3-d aspect: iodine, camphor smoke developing. Developing prints with fire and soot from flame. Works with galvanized metal (zinc plated metal) Dust of excess with natural hair brush. 4 premises of using fingerprints for identification: unique, persistent. Only degrade through decomposition process: classified. Usable in searchable databases: pre birth.
