Milk is a nutrient-rich liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals, including breastfed human infants before they are able to digest solid food. Early-lactation milk is called colostrum, which contains antibodies that strengthen the immune system and thus reduces the risk of many diseases.
It is not permissible according to the obligatory precaution for the husband to drink the milk of his wife, but if he did that , it will not harm his marriage with his wife.
Pure would be permissible for us to use and ritually pure.