The Black Layer Formed on the Prayer Mat

Question

What is the ruling regarding the black layer that forms on the prayer mat? Is it preferable to remove it, or is it permissible to pray on it? [AR_ID:139]

Answer 1

The black layer that forms on the prayer mat due to prostration is generally considered permissible to pray on. It is not obligatory to remove it, as it does not invalidate the prayer.

According to Islamic jurisprudence, the presence of this layer does not affect the validity of the prayer, and one can continue to pray without concern for its removal.

For further details, you may refer to the sources: Sistani's Q&A and Leader's Book.