Ink Chromatography in Forensic Science

The video tutorial demonstrates a simple forensic technique called ink chromatography. It involves using different pens to make ink dots on filter paper, which are then exposed to methylated spirits. The capillary action draws the liquid up through the paper, separating the ink into different colors based on solubility. This method helps identify the pen used at a crime scene by comparing the color patterns. The tutorial explains the setup, execution, and analysis of the experiment, highlighting how different pigments travel based on their solubility.

What is the primary purpose of using ink chromatography in forensic science?

• To identify the type of paper used

• To determine the age of the ink

• To separate and analyze the components of ink

• To test the durability of the ink

What is used to mark the spots on the filter paper in the experiment?

• A crayon

• A pencil

• A brush

• A marker

Why is a paddle pop stick used in the experiment setup?

• To apply ink to the paper

• To measure the liquid

• To hold the filter paper upright

• To stir the methylated spirits

What role does capillary action play in the ink chromatography process?

• It dissolves the ink

• It evaporates the liquid

• It changes the color of the ink

• It draws the liquid up the paper

Which factor determines how far a color travels up the filter paper?

• The temperature of the liquid

• The thickness of the paper

• The solubility of the pigment

• The age of the ink

What is the main characteristic used to identify the crime scene pen?

• The size of the ink dot

• The color pattern formed

• The brand of the pen

• The type of paper used

Which pen is least likely to be the crime scene pen based on the color pattern?

• Pen 1

• Pen 2

• Pen 4

• Pen 3

What is the significance of the blue color in identifying the crime scene pen?

• It indicates the pen is new

• It is the most soluble color

• It shows the pen is old

• It matches the crime scene ink

How can scientists use chromatography in forensic investigations?

• To identify the type of ink used

• To analyze DNA samples

• To find fingerprints

• To determine the time of a crime

What does the presence of multiple colors in a black pen indicate?

• The pen is waterproof

• The pen is made of different pigments

• The pen is of high quality

• The pen is defective