I found out vintage Corelle and Pyrex might contain lead?! I got this 6 piece set for 3$ (half off). I tested it with a swab and it was negative but apparently
32 Piece CORNING CORELLE FRUIT BASKET DISHES SET – 6 Place Settings +2 | Inox Wind
Corelle Dishes Dinnerware Sets Matte Black Dinner Plates Porcelain Plate Mora Ceramics Mug Flat Plates with Rim Boho Plates Rose Gold Dish Set Magnolia - China Corelle Dishes Dinnerware Sets and Matte