Question

Why should curd and sour substances not be kept in brass and bronze vessels?

Hint:

This is why modern kitchenware for storing acidic foods is made of non-reactive materials like glass, stainless steel, or specific food-grade plastics.

Answer 1

Step 1: Understanding the Concept:
Metals can react chemically with acids.

Step 2: Detailed Explanation:
Curd and other sour substances contain naturally occurring organic acids (like lactic acid in curd, citric acid in lemon).
Brass and bronze are alloys containing reactive metals like copper, zinc, and tin.
If sour foods are kept in such vessels, the acids present in the food slowly react with the metals of the vessel.
This reaction leads to the formation of harmful and toxic metallic salts.
Consumption of these toxic compounds can cause food poisoning and health issues.

Step 3: Final Answer:
They shouldn't be kept in these vessels because the acids react with the metals to produce toxic, poisonous substances.