Royal icing doesn't need royal treatment

All of this assumes you have a complete batch of royal icing left over that you plan to use for decorating a dessert later. But what if you've already decorated sugar cookies with detailed designs? To store cookies that have been decorated with royal icing, wrap them in plastic and place them in a bowl. However, keep in mind that they will only stay fresh for about five to seven days before the cookies start to go stale. They will taste best within the first few days.
If you've used royal icing to decorate a cake, it's trickier to wrap it in plastic without damaging the design. Instead, allow the cake to sit in the refrigerator until the royal icing has fully hardened. Once it has set, you can safely wrap it or place it in a sturdy container, where it should remain good for about a week in the fridge. If you think you might need to keep these leftovers for a longer period, you can also freeze the cake or cookies, or even just the icing. Be sure to seal them tightly — batches of royal icing should be stored in resealable bags. In the freezer, cookies and cakes can last for about three months, while pure royal icing can last up to four to six months.
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