Is it sufficient to inform the buyer that the charcoal is mixed with a foreign type without mentioning its poor quality, and what is the ruling on this sale, and is the capital considered corrupt and must be disposed of?

The seller must disclose what the buyer dislikes and what affects the price, because concealing it is forbidden deception. The mere statement by the seller that he mixed two types of coal, without mentioning the poor quality of one of them, is not sufficient; rather, he must disclose its poor quality. A sale that involves deception and fraud does not invalidate the sale according to the relied-upon opinion. However, the buyer has the option either to annul the sale or to uphold it while taking compensation for the defect if the sold item is still available, or only compensation for the defect if it is no longer available.