Red fuming nitric acid

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What Wikipedia says

Red fuming nitric acid (RFNA) is a strong and storage-stable oxidizer. It consists of nitric acid (HNO3), dinitrogen tetroxide (N2O4) and a small amount of water. The color of red fuming nitric acid is due to the dinitrogen tetroxide, which breaks down partially to form the reddish-brown nitrogen dioxide.

Excerpt from the Wikipedia article “Red fuming nitric acid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: W. Oelen, CC BY-SA 3.0, via Wikimedia Commons.