1. To judge the quality of glass or crystal, look for clear, tint-free, distortion-free transparency; a fine, perfectly smooth rim; a long, elegant stem; and a stable foot.
2. To judge the clarity and luster of glass, hold the piece against a pure white background. Inferior grades will show cloudy bluish or greenish tints.
3. To distinguish glass from crystal, hold the glass to light. If the glass acts as a prism and you can see a rainbow, you are holding crystal. Also, when struck, crystal produces a musical ring. Glass does not.
4. Do not store food or beverages in crystal containers for long periods of time.
5. Do not pour hot liquids into cold crystal, or cold liquids into hot crystal. The drastic change in temperature can crack the crystal.
6. Do not put crystal in a microwave, oven, or freezer.
7. When washing glass or crystal: use mild soap, place a rubber mat in the sink, and use a faucet guard to prevent chipping.
8. Dry your crystal with a soft, lint-free cloth to prevent water spotting.
9. Crystal is not dishwasher-safe. Dishwasher detergent is corrosive and the heat from a dishwasher may crack the crystal.
10. Before washing China, wipe it with a paper towel or soft brush; you should never use a knife or harsh utensil to scrape food. 11. China dishes with dried-on food should be soaked in warm water for several minutes; avoid using abrasives, such as scouring powders and steel wool.