Question

buttermilk spoil if kept in copper or brass container

Answer 1

Butter milk contains some amount Lactic acid that react with copper or brass container (metal) to produce toxic salt and hydrogen gas.

Answer 2

Answer:

Copper or Brass reacts with organic acids that is lactic acid persent in buttermilk. When this acid reacts with copper or brass it produces toxic salts these salts spoils the buttermilk, thus causing food poisoning.

Explanation