How does one harden marzipan?

To harden marzipan, roll it out to your desired shape and thickness, then allow it to air dry in a cool, dry place for several hours or overnight. You can also place it in the refrigerator for a faster hardening process. Once it has dried, it will become firmer and easier to handle for decoration or storage. Avoid humidity, as it can affect the texture and consistency of the marzipan.