Curd and sour substances should not be stored in brass or copper vessels. Why?
Generated by claude-sonnet-4-6 · 2026-06-26 01:03 · grounding rag
Model Answer
Curd and sour substances contain acids (such as lactic acid). These acids react with brass (copper-zinc alloy) or copper vessels to form harmful salts, which can cause food poisoning. Storing such foods in these vessels makes the food toxic and unsafe for consumption.
Source: Chapter 3, Section 3.5 (Corrosion)
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Explanation
- The key point examiners expect: acids in sour food react with the metal/alloy to produce poisonous/harmful compounds, making food unsafe.
- Mention that curd/sour substances contain acid — just saying "acidic" is enough; naming lactic acid is a bonus.
- Do NOT just say "it causes corrosion" — you must link it to harmful salts or food becoming poisonous, as that is the reason for the practical concern.
- Two marks: one for the reason (acid reacts with metal) and one for the consequence (harmful/toxic compounds formed).