Is it permissible to mix red henna with black katam and apply it to the gray hair of the beard?

The questioner : May Allah reward you, O Shaykh. This question was requested to be conveyed to you. The questioner asks: Is it permissible to mix red henna with black katam and apply it to the gray hair of the beard, such that after application, the beard appears black from a distance, but when viewed up close, the color is distinct and leans toward dark brown?

The Shaykh : Yes, the Sunnah is to change gray hair with henna, or with henna and katam. If you mix it with henna, it becomes yellow, and if you mix it with henna and katam, it becomes between red and black. There is no harm in it, and no blame, if Allah wills.