Chromium(III) hydroxide

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What Wikipedia says

Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH)3. It is a polymer with an undefined structure and low solubility. It is amphoteric, dissolving in both strong alkalis and strong acids.

Excerpt from the Wikipedia article “Chromium(III) hydroxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Roterham, CC0, via Wikimedia Commons.