Use coasters under beverage glasses and saucers under cups and flowerpots. If a spill occurs, immediately blot it gently without rubbing the surface. Heat creates a chemical change in the furniture finish, which can result in a white spot. Use protective pads under hot dishes, utensils or cooking appliances. High humidity causes wood to swell.
Low humidity causes wood to lose moisture and shrink.
Extreme changes cause warping, splitting and cracking. Try to keep humidity as constant as possible.