Question
| Column I | Column II |
| Indirect dyes | Congo red |
| Direct dyes | Alizarin |
| Vat dyes | Methylene blue |
| Basic dyes | Picric acid |
| Acid dyes | Indigo |
✓
Answer
| Column I | Column II |
| Indirect dyes | Alizarin |
| Direct dyes | Congo red |
| Vat dyes | Indigo |
| Basic dyes | Methylene blue |
| Acid dyes | Picric acid |
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