Metanil yellow, a non-permitted dye, is often used to adulterate turmeric. Which chemical test can confirm its presence?
Show answer & explanation
Correct answer: B
Explanation
Answer: Alcohol and hydrochloric acid test yielding pink color
Explanation
Metanil yellow is a synthetic coal-tar dye prohibited for use in food because it is highly carcinogenic and can cause stomach disorders and neurotoxicity. It is commonly used to adulterate turmeric powder to give it a bright yellow appearance.
Key Facts for Exams
Chemical Nature: Metanil yellow is an azo dye.
Health Impact: Long-term consumption can lead to liver damage and brain damage (neurotoxicity).
Exam-Related Practice Questions
Q: What is the primary health risk associated with the consumption of metanil yellow?
Answer: It is carcinogenic and neurotoxic (toxic to the brain).
Q: Which concentrated acid is specifically used to confirm the presence of metanil yellow in food items?
Answer: Hydrochloric acid (HCl).