During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results ?

Options

A. Column chromatography
B. Solvent extraction
C. Distillation
D. Thin layer chromatography

Explanation

**Step-by-Step Solution:**

1. **Understanding the Context**: The question involves a court case where the judge suspects that changes have been made to documents. The forensic department is tasked with checking the ink used at two different places in the documents.

2. **Identifying the Technique**: To analyze the inks, the best technique to use is Thin Layer Chromatography (TLC). This method is effective for separating and analyzing mixtures, including inks.

3. **Explaining Thin Layer Chromatography**:
- **Definition**: Thin Layer Chromatography is a technique used for separating non-volatile mixtures. It involves the use of a stationary phase (adsorbent) and a mobile phase (eluent).
- **Process**:
- A thin layer of adsorbent (such as silica gel) is coated on a glass plate.
- The ink samples are applied to the plate.
- The plate is then placed in a solvent (eluent), which rises through capillary action.

4. **Separation Mechanism**: As the eluent rises, the components of the ink mixture move with it at different rates due to varying degrees of adsorption to the stationary phase. This results in the separation of the different components of the ink.

5. **Conclusion**: Based on the principles of Thin Layer Chromatography, it allows for the effective separation and identification of the inks used in the documents. Therefore, the best technique to check the inks is Thin Layer Chromatography (TLC).

6. **Final Answer**: The best technique to analyze the ink used in the documents is Thin Layer Chromatography (TLC).

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