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Almost all of the pieces are back to their shiny state.But there are some stains that are so stubborn I'm not sure how to clean.This warranty does not apply to damage resulting from improper cleaning with abrasive cleaners, or cover the interior or exterior against discoloration or stains acquired during normal use.
While technically a trademark, it is most often seen referred to as a backstamp. The configuration of the backstamp would undergo a few revisions after the introduction of opal glass kitchenware in 1945. A listing of patterns by year of introduction can be found .
DO NOT place PYREX® glass cover on or under a flame or other direct heat source, including a stovetop, under a broiler, on a grill or in a toaster oven. To prevent permanent stains and blisters, AVOID REHEATING foods high in oil, fat, sugar or tomatoes. To minimize leaking and dripping, and ensure proper sealing of cover to dish, exert downward pressure when applying cover. Open vent when removing cover and prior to microwave use.
USES: PYREX glass covers can be used for cooking, baking, warming, and reheating food in microwave ovens and in preheated conventional or convection ovens. Make sure vent tab is closed during transportation and storage.
All glass-ceramic CORNINGWARE® can be used in conventional, convection, toaster and microwave ovens, on a rangetop, under a broiler, in the refrigerator, freezer and in the dishwasher. If scouring is necessary, use only plastic or nylon cleaning pads with nonabrasive cleansers.
CHECK PACKAGING FOR COMPONENT PARTS INCLUDED WITH YOUR PURCHASE GLASS COVERS See warnings for glass covers stated above. For plastic covers with vent tabs, install cover with vent open.
When visiting my local thrift stores, I've picked up a few of the old pyroceram pieces that are microwave/ range/ freezer/ stove safe.