fingerprint development and ridge characteristics
DESCRIPTION
I made this to show ridge characteristics to my studentsTRANSCRIPT
![Page 1: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/1.jpg)
Fingerprints
![Page 2: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/2.jpg)
Fingerprint origin
• During the third or fourth month of fetal development the sweat glands form in the skin through small pores. Pores link together to form a series of ridges that are unique to every individual.
![Page 3: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/3.jpg)
How are fingerprints made?
• Materials are continually secreted from the pores in the skin within the ridges of the fingers.
• 98-99% of the secreted material is water and the other 1-2% is other organic and inorganic materials.
![Page 4: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/4.jpg)
• Any sebaceous oils on the fingers is transferred from other areas of the body and is collected in the ridges.
• Other objects that have an oily or greasy residue also transfer materials to the fingers when touched.
![Page 5: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/5.jpg)
• All of the materials that gather in the ridges can be transferred from the finger to the touched object…leaving behind a distinct fingerprint
![Page 6: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/6.jpg)
Types of prints
• There are three types of prints that can be found at the scene of a crime.– Latent– Patent– Plastic
![Page 7: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/7.jpg)
Latent prints
• Latent prints are considered to be any print that is not easily seen.
• They require Processing with the use of powder and/or chemicals like super glue fuming
![Page 8: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/8.jpg)
Patent prints
• Patent prints are any print that can be easily seen because they were made with a substance on the fingers…such as blood, oil, or ink.
• Patent prints need to be photographed and then collected using lifting tape…they do not require chemicals
![Page 9: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/9.jpg)
Plastic prints
• Plastic prints are three-dimensional impressions made in a substance that holds the shape of the ridges on the fingers such as putty, clay, or wax
• Plastic prints should be photographed first and foremost and then attempts can be made to get an impression using plaster or other casting materials
![Page 10: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/10.jpg)
Analyzing prints
• In the past fingerprints were analyzed by fingerprint analyzers and then they would be compared to fingerprints on file.
• Now, computers do the work by digitally scanning prints into a large database called the Automated Fingerprint Identification System (AFIS).
![Page 11: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/11.jpg)
• The computer uses an automated scanning device to convert the image of a fingerprint into digital ridge characteristics
![Page 12: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/12.jpg)
What is analyzed?
• Ending ridge• Fork (bifurcation)• Island ridge• Dot• Bridge• Spur• Eye• Double bifurcation• Trifurcation
![Page 13: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/13.jpg)
Ridge ending
![Page 14: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/14.jpg)
Fork/Bifurcation
![Page 15: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/15.jpg)
Island ridge
![Page 16: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/16.jpg)
Dot
![Page 17: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/17.jpg)
Delta & Bridge
![Page 18: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/18.jpg)
Spur
![Page 19: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/19.jpg)
Double bifurcation
![Page 20: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/20.jpg)
Eye
![Page 21: Fingerprint development and Ridge Characteristics](https://reader034.vdocument.in/reader034/viewer/2022052601/559472e11a28abe2548b45cb/html5/thumbnails/21.jpg)
Trifurcation