Textile Fibers is the basic and principle raw materials to produce various types of textile finished products. A fiber that can be spun into yarn or processed into textile such as a woven fabric, knit fabric, lace, felt, non-woven etc by means of an appropriate interlacing method is called as Textile Fibers.

Generally Textile Fibers can be classified into main two types:

👉 Natural fiber And,

👉 Synthetic fiber/Manmade fiber/Artificial fiber.

Textile Fibers can also be classified in the following ways:

✍ Classification of textile fibers based on sources

✍ Classification of textile fibres based on polymer

Textile Fibers and Forensic Science

Textile fibers are a key form of trace evidence, and the ability to reliably associate or discriminate them is crucial for forensic scientists. While microscopic and instrumental analysis can be used to determine the composition of the fiber.

Additional specificity is gained by examining fiber color.

Question: What is the Purpose of Document Examination?

Answer: The examination of a document is conducted to determine:

✔ Origin—where did the document come from?

✔ Production source—what person or machine produced it?

✔ Production process—how was it made?

✔ Inscription—what has faded or been obliterated?

✔ Chastity—what changes, if any, have been made to it?

✔ Integrity—is it genuine or false?

✔ Legitimacy—is it an original or a reproduction, and if so, what generation?

👉 The reason for collecting this information is to shed light on events in the history of the document that have occurred prior to its arrival in court.

👉 This will enable the court to confirm assumptions that may otherwise be made.

Formulations for Chemical Solutions

1.) Ninhydrin (Kent, 1998; Champod et al., 2004, p 239)

Stock Solution: 25 g ninhydrin dissolved in 225 mL absolute ethanol, 10 mL ethyl acetate, 25 mL glacial acetic acid.

Working Solution: 52 mL of stock solution diluted to 1000 mL with HFE 7100.

2.) Zinc Chloride Solution (Champod et al., 2004, p 240)

Stock Solution: 8 g zinc chloride dissolved in 180 mL ethanol, 20 mL glacial acetic acid.

Working Solution: 6 mL of stock solution diluted to 100 mL with carrier solvent (e.g., HFE 7100).

3.) 1,8-Diazafluoren-9-one (DFO) (Kent, 1998; Champod et al., 2004, p 230)

0.25 g of DFO dissolved in 30 mL methanol and 20 mL glacial acetic acid. Add this to 725 mL HFE 7100 and 275 mL HFE 71DE.

4.) Nonpolar Ninhydrin (Stimac, 2003a, pp 185–197)

Stock Solution: 1.5 g ninhydrin dissolved in 100 mL HFE 71IPA (may require refluxing at low temperature).

Working Solution: 15 mL of stock solution diluted with 100 mL HFE 7100.

5.) 1,2-Indanedione

0.25 g 1,2-indanedione dissolved in 90 mL ethyl acetate and 10 mL glacial acetic acid. Add this to 1 L of HFE 7100 (Merrick et al., 2002, pp 595–605). or 2 g 1,2-indanedione dissolved in 70 mL ethyl acetate. Add this to 1 L HFE 7100 (Almog et al., 1999, pp 114–118).

6.) 5-Methylthioninhydrin (5-MTN) (Wallace-Kunkel et al., 2006, pp 4–13)

1.7 g 5-MTN dissolved in 52.5 mL ethyl acetate, 50 mL methyl tert-butyl ether, 12.5 mL absolute ethanol, and 5 mL glacial acetic acid. Add this to 360 mL HFE 7100.

7.) 2-Isononylninhydrin (INON, Thermanin) (Al Mandhri and Khanmy-Vital, 2005)

4–5 g INON dissolved in 15 mL ethyl acetate, 5 mL isopropanol, and 980 mL HFE 7100.

8.) Silver Nitrate (Trozzi et al., 2000, pp 38–39)

COOLING OF THE BODY AFTER DEATH A body is not a uniform structure. It’s temperature will not fall evenly and because each body will lie in its own unique environment, each body will cool at a different speed, depending upon the many factors surrounding it.

Question- What do i know about Crime Scene?

Answer- The scene of a crime is the starting point of physical evidence, and the care with which a scene is processed is crucial to the success of any investigation based on it. A primary goal of the crime scene investigator is to preserve the scene in both time and space, allowing for it to be processed. Investigators also face the possibility of more than one scene for the same offense. For example, a murder may be committed in one place (the primary scene) and the body dumped somewhere else (the secondary scene). Crime scenes are easily contaminated by unauthorized and unnecessary traffic, and once lost, a scene can never be recovered.

This video is for those who are confused about this field, they should pursue it or not. for the right answer please watch the video till end.

https://youtu.be/8x-q9gi9k3E ((Link in Bio))