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if I soaked a platinum dish with 30% hydrogen peroxide, will it eventually eat away at it?

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    $\begingroup$ Nope. On the contrary, hydrogen peroxide will decompose pretty quickly. $\endgroup$ – Ivan Neretin Mar 22 '17 at 20:25
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Yes, as @Ivan said, hydrogen peroxide will not corrode platinum, instead hydrogen peroxide will get decomposed.

Catalytic decomposition of hydrogen peroxide by metals and alloys of the platinum group:

The catalytic decomposition of dilute aqueous solutions of hydrogen peroxide has been studied on a number of Group VIII metals and binary alloys, including palladium-gold. The kinetics were measured at 27 ° as a function of catalyst composition and pH of the solution. In neutral solution, the activity of the individual metals of Group VIII was generally greater than those of Group VIII2, the order of specific activity (per unit surface area) decreasing in the sequence $\ce{Pt > Os > Ir > Pd > Ru > Rh}$. (...)

Other references:

  1. http://ac.els-cdn.com/S0926337306001561/1-s2.0-S0926337306001561-main.pdf?_tid=a114888e-1c29-11e7-9622-00000aacb360&acdnat=1491635258_a3e20984dda9eaaf07e78f4814383b96
  2. http://pubs.acs.org/doi/abs/10.1021/ed080p788
  3. http://jcsp.org.pk/ArticleUpload/2541-11513-1-CE.pdf
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