platinize

verb
plat·​i·​nize | \ˈpla-tə-ˌnīz \
platinized; platinizing

Definition of platinize 

transitive verb

: to cover, treat, or combine with platinum or a compound of platinum

First Known Use of platinize

1825, in the meaning defined above

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The first known use of platinize was in 1825

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