How can it be verified that the alcohol used in cosmetics, perfumes, and creams has undergone a complete transformation (istihalah) such that it does not cause intoxication and no longer remains ritually impure (najis)?

The ruling on perfumes depends on their components; if they are pure and permissible, unless they are harmful. If they are made from impure substances like alcohol, their use is prohibited unless they undergo a complete transformation (istihalah) and turn into another pure substance, such as alcohol turning into vinegar. What is mentioned in the texts regarding the prohibition of carrion, blood, pork, and alcohol does not apply to plants, fruits, ashes, salt, soil, and vinegar. As for the transformation of substances into something that superficially resembles them but differs chemically, this requires the knowledge of specialists, and they do not transfer from the ruling of impurity unless there is certainty.