Original oil and gas trade magazine vintage ad for DIAMOND ALKALI COMPANY, of Cleveland, OH. We Help Scrub Oil Products Too. A lot of Diamond Alkali Caustic Soda helps make soap for scrubbing little boys faces, but a larger amount flows into refineries to help scrub gasoline and kerosene, and for cleaning up petroleum fractions. Chemicals for the oil industry. This unique 1950 petroleum petrochemical refining industry magazine advertisement would display beautifully matted and framed.