Denaturing is a process that involves changing the chemical structure of a substance, usually by the addition of a chemical agent or through exposure to heat or radiation. Antonyms for the word denaturing include restoring, repairing, and preserving. These words are associated with the concept of maintaining the natural state or integrity of a substance, rather than altering it. Other antonyms for denaturing may also include words like protecting, salvaging, or conserving, which suggest the idea of maintaining or safeguarding the original properties and characteristics of a material or product. Overall, antonyms for denaturing are words that describe activities that aim to maintain or restore the natural state of a substance, rather than altering it.