Is tayammum (dry ablution with clean earth) valid on a wall?

Question : I have seen some of them prefer the wall in the desert.

Answer : Yes, and that is the case. The wall is connected to the earth, and there is no issue with that. The Prophet (peace and blessings be upon him) performed tayammum from a wall. However, a wall covered with paint: the paint is not earth and is not of the same kind as earth. If there is dust on it, it is sufficient. Otherwise, one should perform tayammum on something else. It may be said that since this paint is attached to the wall, on which tayammum is valid, it follows the wall. But yes, if there is nothing else available, there is no harm. Otherwise, it is better not to perform tayammum on it. Yes.