Mood Mudd comes in 4 colors that change by the heat of your hand.

If you purchased Mood Mudd in a warm location (the store is outside or does not have air conditioning) the color may already be changed. In this case you can either leave it at room temperature and it will change back to it’s “base” color, or you can put it in the refrigerator or freezer. Leaving it in the freezer will not hurt it.

The best way to observe the color change is to make sure the Mood Mudd is at it’s “base” color. Then break off a little piece so that your hand can warm it more quickly.