I’m extremely skeptical corningware contains lead which can come off… it’s sealed, ultra hard ceramic. that’s not how people have historically gotten lead contamination. there’s probably more lead in the soil in their front yard than in every piece of corningware in the house…

please don’t destroy these, just donate them to a thrift shop so sensible folks can use them as intended. many of those vintage ceramics are collectibles, more importantly they are infinity reusable.