Buying and Selling: Selling an Impure Item

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 2064

There is no problem in selling an item that has become impure but is washable and may become pure (ṭāhir), such as a rug or utensil. The same applies if the item is not washable but the lawful and usual use of it is not dependent on it being pure, such as crude oil. In fact, even if its lawful and usual use is dependent on it being pure, in the event that it has a lawful and significant benefit, it is permitted to sell it.

-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling