Is the ice in a picnic ice sheet poisonous? Like: http://www.igloocoolers.com/Ice-Substitutes/Ice-Sheets/MaxCold-Natural-Ice-Sheet-2-Pound
My daughter tore it open and ate some. It isn't blue, and looks like ice, but I don't know. I dont know what brand it is, but I dont think it's the one in the link- it just looks like that. I'm worried.