How to get rid of a Nobel Prize, and fast!

Imagine you're a world-famous physicist working in Copenhagen, Denmark in 1940.  You've been sheltering Jewish physicists who fled German troops for years, and the Nazi party knows it.  In fact, two Jewish scientists have sent their solid gold Nobel Prizes to you for safekeeping.  Now, Nazi troops are literally marching through the streets of your city looking for you.  You NEED to get rid of these medals, but how?  CHEMISTRY - that's how!