I use weringue powder. But I think its the amount of powered sugar that goes into it, that is a perservitave. I make potato candy (potato and icing sugar) and they dont go bad 
Golly, I thought I was the only one who knew about potato candy!
Sorry, I dunno why. I supposed it's because everyone says they're not really meant to be eaten because they're so hard. However, I eat them; but I'm a sugar hound. I do know that my Royal, and I use meringue powder,too, does go bad. It gets musty tasting and smelling if left on the counter for more than a few days.
how do you store your potato candy Cheatize? Also I find that if my Royal is not stored air stight it gets watery and such
I mainly use Glace, which i have kept in the fridge for a month or so and it has been fine ")
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