My mom left a good portion of her kitchenware collection to me before moving to Canada. Many of her stuff actually belonged to my grandma. So, when they came to me, most of their shopping history, catalog and user manual are lost. I am specially concerned with the Pyrex and Marinex dishes. None of them have "oven safe" written on them. I have two sets of round casserole dish with lids from both of the brands and a rectangular dish from Pyrex. Should I put them into oven? How would I know? Help me please.