Metol

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Metol is a trade name for the organic compound with the formula [HOC6H4NH2(CH3)]2HSO4. It is the sulfate salt of N-methylaminophenol. This colourless salt is a popular photographic developer used in monochrome photography.

Excerpt from the Wikipedia article “Metol”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jü, Public domain, via Wikimedia Commons.