Sodium sulfide

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Sodium sulfide is a chemical compound with the formula Na2S. More common is its hydrate Na2S·9H2O. Both the anhydrous and the hydrated salts are colorless solids, although technical grades of sodium sulfide are generally yellow to brick red owing to the presence of polysulfides.

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

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