👉 The term "chromous" is a combination of two words, "chroma" and "sulfur." Chroma is a color that occurs when sulfur dioxide reacts with oxygen in air. Sulfur dioxide is a gas that can react with sunlight to form sulfuric acid (H2SO4). When this reaction takes place, the sulfur dioxide is released as a white or gray cloud of sulfuric acid and other gases. The term "chromous" refers to the color change that
