👉 Fumes, often invisible and pungent, can appear in various shades depending on their composition and the substances they contain. Commonly, they are seen as a hazy, grayish-brown or yellowish-brown mist, which can range from light to dark, resembling smoke but typically more translucent and less dense. In industrial settings, fumes might take on a reddish-orange hue due to the presence of certain metals like iron or copper oxides, while in chemical labs, they could appear as a greenish-blue or even a deep purple, depending on the specific chemicals involved. These colors are not only visually distinct but also indicate the presence of various gases or particulates, often signaling potential hazards that require attention to ensure safety.