What was the manner of applying kohl that the Prophet, peace and blessings be upon him, used to practice, and did he do so at specific times? And what about the type of kohl applicator, and are the kohl applicators sold in women's shops forbidden?

There is no specific method for applying kohl, but it is preferable to apply it an odd number of times, meaning three times in each eye, which is what the Prophet, peace and blessings be upon him, did. He used to apply ithmid kohl every night, and he encouraged its use, explaining its benefits for the eye and hair. There is no difference between kohl for men and women from a legal perspective.