Boiling Something in an Impurity

Q: Taharaat-72: Pieces of turmeric is sometimes boiled in the urine of cows and buffaloes or with their dung, causing the sand to come clear of it. It is then dried in the sun. Will it be pure or not?

Answer: The pieces of turmeric will not be pure when boiled in an impure substance such as dung and then washed and dried in the sun.

Fatawa Rahimiyyah vol.2