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platinum black

noun
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Definition of platinum black

: a soft dull black powder of finely divided metallic platinum obtained by reduction and precipitation from solutions of its salts that is capable of occluding large volumes of hydrogen, oxygen, or other gases and that is used as a catalyst for hydrogenation or oxidation

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“Platinum black.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/platinum%20black. Accessed 15 Apr. 2021.

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