does anyone know how long Meringue Powder stays good for...you know shelf life...im so stressed trying to get everything done{my daughters turning 16}and im haveing 2 parties...one tonight for 8 girls{a sleepover} and one tomorrow for family..and i forgot to pick up Meringue Powder...i want to add some to the cake to make it raise more when cooking...i found some {Meringue Powder} up in my cupboard but im sure its a few
"years" old...I dont want to ruin the cake..help someone...PLEASE
Janet
how old is the one you have ? I keep mine for two years or more and keep using it until it's gone.
It is a dry powder, that should not a be a problem. 
Meringue Powder
Meringue powder is basically dried egg whites with the addition of sugar and gum. Meringue is created when the powder is added to water and is then whipped. Like all other uncooked egg products, meringue powder is pasteurized so it is very useful when preparing dishes requiring uncooked meringues. It also has a long shelf life (over one year)
You know what else I found out because of your post?? It's supposed to be refrigerated after opening! I never realized that before!! Oops I never refrigerated mine.
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