|Vibhuti Ash on Forehead|
Normally, yogis use the ash that they pick up from the cremation grounds. If this ash cannot be used, the next alternative is to use cow dung. There are other substances used but the basic material, the body of it, is cow dung. If even this ash cannot be used, the next alternative is to make vibhuti of rice husk. This is indicative that the body is not the core substance, it is just the husk.