There are so many doubts regarding Rudraksha, on such doubt is Rudraksha soaked in milk. Some people want to know if Rudraksha soaked in milk overnight lose power or changes shape.
No, if the Rudraksha is real nothing will happen to it.
But if the Rudraksha is fake then you can expect some color change or slight change of shape. Some might even turn the milk to brown or red or black.
Original Rudraksha never loses its power in water, milk or other similar liquids.
It is better to purchase Rudraksha from famous and original source.