The ruling on applying henna, gum, or honey to the head of a person in ihram

The Shaykh : Applying henna to the head, or gum, or honey, is permissible. It is established that the Prophet (peace and blessings be upon him) applied a substance to his head, meaning he placed on it some gum or something similar to keep the hair from standing up, while he was in ihram. This indicates that if a person wants to apply henna to his head while in ihram, there is nothing wrong with it, because can it be said that he is shaving his head? He is not shaving his head if he applies henna that is visible and seen. However, this is different from a doctor, for example, or a bandage placed on the head; that would be shaving.