How long does royal icing last on the shelf. Antonia's to be specific.

Thanks!
Angie

Using powdered egg whites/meringue powder, you are good for up to a week. Just rebeat it before use as it will start to separate .

There's nothing in it that will go bad. I've had a WELL-SEALED bowl of it on the counter for several weeks. Yeah you do have to rewhip it, but I've never had to throw it out. I used to dump all the excess after each project, then I thought I'd just save it to see what happens, now I have all these little plastic bowls with the various colors, one big one of black and one big of white. I put them in a big ziploc and leave on the counter until needed.

I have had some for a quite a while (serveral months)and I was wondering could it go bad with all the sugar content in it.

Thanks
Angie