Sapphire Wafers. Lithium Niobate Wafers. Sapphire is a material of a unique combination of physical, chemical and optical properties, which make it resistant to high temperature, thermal shock, water and sand erosion, and scratching.
Put a tortilla on a plate, covered with a damp paper towel. Alternate tortillas with paper towels. Microwave for 30 seconds to one minute, depending on how many tortillas. Preheat the oven to 250 degrees. Wrap a stack of tortillas in a damp dish towel and place in a casserole dish of similar size. Cover with a lid or a piece of aluminum foil tightly on the dish. Place in oven for 20 minutes. Once the tortillas are heated, transfer them to a tortilla warmer to keep them nice and hot.
Preheat the oven to 350 degrees. Either brush or spray olive oil on the corn tortillas. Place the tortillas on a baking sheet if making tostadas or cut the tortillas into strips or 4 wedges for chips and place on baking sheet. Bake for 7 minutes at 350 degrees, rotate pan and bake an additional 7 minutes more, until crisp but not brown. Top with your favorite toppings.