Question

how can we know whether water is added to milk or not?

Answer 1

Milk slip test - Put a drop of milk on a polished vertical surface. ... Milk mixed with water or other agents will flow down immediately without a trace. Reduction test - Boil some milk on a slow heat while moving it with a spoon till it becomes solid (khoya). Take it off the heat and wait for 2-3 hours.

Answer 2

boil some milk on a slow heat while moving it with a spoon till it becomes solid . take it off the heat and wait for 2-3 hours . if the produced solid is oily it is good one if it is not oily it is synthetic