What is the minimum amount of purity that is considered purification in menstruation and post-natal bleeding?

Question : This is Fu'ad al-Juhani asking: What is the minimum amount of purity that is considered purification in the days of menstruation or post-natal bleeding? And what is the ruling on the blood that comes down in those days after the purity and cleanliness have become clear?

Answer : We mentioned this in detail in our book *Natural Bloods*, so refer to it.