Oleum, also known as fuming sulfuric acid, is a highly concentrated solution of sulfur trioxide in sulfuric acid. Maruti Fine Chemicals ensures the highest standards of purity and safety in their Oleum 23%, catering to the stringent needs of industrial applications. Visit - https://www.indiamart.com/proddetail/fuming-sulphuric-acid-oleum-acid-19637850512.html?sellerpreview=1