For this reason, you should always put a coin in your freezer

How to Select the Right Container for the Hack

The container in which the coin trick will be done also plays a very pivotal role. A short, shallow container, such as a plastic cup, or a food storage lid, is perfect because it freezes in no time and provides a stable platform for the coin. Avoid using tall narrow containers since they freeze longer and the coin sinks deep in if the ice thaws unevenly.

You can tell instantly if thawing occurred using a transparent container. For example, you won’t need to dig through the ice or move around things in the freezer to determine whether thawing occurred.