Forensic Chemistry: Fingerprinting Methods
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Questions and Answers

At what point in time are fingerprints formed according to the text?

  • At birth
  • During childhood
  • After birth
  • Before birth (correct)

Which of the following statements accurately describes fingerprints?

  • Fingerprints change frequently throughout life
  • Fingerprints are not unique to individuals
  • Fingerprints are formed after death
  • Fingerprints are unique and remain unchanged (correct)

What is the primary characteristic of fingerprinting according to the text?

  • It is formed during childhood
  • It changes frequently throughout life
  • It is the most accurate and reliable method of identification (correct)
  • It is unreliable and inaccurate

When do fingerprints start to change according to the text?

<p>Never change (C)</p> Signup and view all the answers

What happens to fingerprints after death based on the text?

<p>They remain unchanged until body decomposes (C)</p> Signup and view all the answers

What is the color of fluorescent powders?

<p>Red, yellow, green or orange (D)</p> Signup and view all the answers

Which of the following can fluorescent powders contain?

<p>Iron particles (B)</p> Signup and view all the answers

What is the purpose of fluorescent powders?

<p>The text does not provide information about the purpose of fluorescent powders (A)</p> Signup and view all the answers

How many different colors of fluorescent powders are mentioned in the text?

<p>4 (B)</p> Signup and view all the answers

Which of the following is not a characteristic of fluorescent powders mentioned in the text?

<p>They are used in laser printers (D)</p> Signup and view all the answers

What type of impressions can be made by pressing your fingers in fresh paint, wax, soap, butter, or tar?

<p>Three-dimensional (C)</p> Signup and view all the answers

Which of the following materials can be used to create plastic fingerprints visible to the naked eye?

<p>Tar (D)</p> Signup and view all the answers

What is the visibility of the plastic fingerprints created by pressing fingers in various materials?

<p>Visible by naked eye (B)</p> Signup and view all the answers

Which of the following impressions can be made by pressing fingers in fresh paint, wax, soap, butter, or tar?

<p>Plastic (D)</p> Signup and view all the answers

What distinguishes the impressions made by pressing fingers in fresh paint, wax, soap, butter, or tar?

<p>They are permanent (B)</p> Signup and view all the answers

What types of fingerprints are visible to the naked eye?

<p>Patent fingerprints (B)</p> Signup and view all the answers

Which of the following materials can form visible fingerprints?

<p>Blood (A)</p> Signup and view all the answers

How are visible fingerprints different from latent fingerprints?

<p>Visible fingerprints are formed by colored materials like blood or paint (A)</p> Signup and view all the answers

Which of the following is NOT a type of visible fingerprint?

<p>Sweat fingerprints (D)</p> Signup and view all the answers

What is the main characteristic of visible fingerprints?

<p>They are formed when fingers come into contact with colored materials (D)</p> Signup and view all the answers

What is a latent fingerprint?

<p>A fingerprint that is invisible to the naked eye (D)</p> Signup and view all the answers

What types of surfaces can latent fingerprints be deposited on?

<p>Smooth, rough, porous, and non-porous surfaces like metal, glass, or plastic (B)</p> Signup and view all the answers

What is the primary composition of a latent fingerprint?

<p>Natural oils and sweat (B)</p> Signup and view all the answers

Which of the following is a characteristic of a latent fingerprint?

<p>It is formed when the skin touches a surface (C)</p> Signup and view all the answers

Which of these statements about latent fingerprints is true?

<p>They are created by the natural oils and sweat on the skin (D)</p> Signup and view all the answers

Study Notes

Fingerprint Formation

  • Fingerprints are formed during fetal development, around the 10th week of gestation.

Fingerprint Characteristics

  • Fingerprints are unique to each individual.
  • They are permanent throughout life.

Fingerprint Change

  • Fingerprints begin to change after death, but they remain recognizable.

Fingerprint Visibility

  • Visible fingerprints are impressions left on surfaces by pressing a finger.
  • They are visible to the naked eye.
  • They can be made by pressing fingers into fresh paint, wax, soap, butter, or tar.
  • The impressions are often distorted and can become altered.
  • Materials such as clay, dough, and modeling compound can also create visible fingerprints.
  • Visible fingerprints are distinct from latent fingerprints.

Latent Fingerprints

  • Latent fingerprints are invisible to the naked eye and require special techniques to be visualized.
  • They are composed primarily of sweat and oils from the skin's surface.
  • They are often deposited on surfaces, which can include glass, metal, wood, and paper.
  • Fingerprint powder is commonly used to visualize latent fingerprints.
  • The use of fluorescent powder can enhance the visibility of latent fingerprints, especially on dark surfaces.

Fluorescent Powder

  • Fluorescent powders are visible with ultraviolet (UV) light.
  • Some fluorescent powders can be viewed with a black light or a UV flashlight.
  • They are available in multiple colors: blue, green, orange, red, white, yellow, magenta, and pink.
  • They can contain chemicals such as zinc sulfide, zinc cadmium sulfide, and calcium tungstate.
  • They are used to visualize latent fingerprints on surfaces and create a contrasting effect.

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Explore the accuracy and reliability of fingerprinting as a method of identification in forensic chemistry. Discover how fingerprints are formed before birth and remain unchanged until the decomposition of the body after death.

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