Sadly I don't know. I used pasteurized egg whites not meringue powder. I wasn't happy with the flat finish though. So I started experimenting (which as we all know is not always a good thing lol) I ended up doing half royal and half glaze. So far I'm happy with the results. Its not as hard or as sweet as the royal icing but it does have more puff to it. Still not as shiny as i want it though. 😀