Zoheir Ali Esmail, Shaykh Zoheir Ali Esmail has a Bsc in Accounting and Finance from the LSE in London, and an MA in Islamic Studies from Middlesex University. He studied Arabic at Damascus University and holds a PhD... Answered 6 years ago
Thank you for your question. As long as the darkness is not due to any barrier between the turbah and the forehead you can prostrate on it. Usually, the darkness is due to water or swear and so the darkness is just discolouration of the clay rather than a barrier.
May you always be successful
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