[Machine] The greying of the Prophet's ﷺ beard was such that when he applied oil to it, the greying would not be apparent, and when he left it without oil, the greying would be apparent.
«كَانَتْ شَيْبُ النَّبِيِّ ﷺ إِذَا سَرَّحَ لِحْيَتَهُ أَظُنُّهُ قَالَ ودَهَنَهَا لَمْ يَتَبَيَّنْ وَإِذَا تَرَكَهَا تَبَيَّنَ»