Is it permissible to sell lead (plumb), knowing that it is often used by women for purposes of sorcery?

The basic principle is that it is permissible to sell this material to someone who will use it for permissible purposes. However, if the seller knows the corrupt intention of the buyer, then it is not permissible to sell it to him, because this falls under cooperating in sin, which is forbidden by the Almighty's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." This is also based on the قول of the scholars regarding the prohibition of selling grapes to someone who will turn them into wine. As for if the seller is unaware of the buyer's condition, there is no blame upon him.