CDC paper. The company responsible for one of these poisonings is likely Oh Sweet Art, located in Palm Bay, Florida.
Their decorative “non-toxic” powders, which may contain up to 25% lead, are still available on Amazon (lol).
Modified the title to reflect what, specifically, is a problem with the cakes, so there’s no panic about every hunk of fondue.
Just let cakes look like cakes goddammit! Stop making them look like cars or cartoon characters or any of that bullshit. Decorate the thing with real food stuff like fruit or cream or marzipan instead of that chemical crap.