If it beads up, the wood has a hard finish. To identify which hard finish, rub acetone over a spot in a gentle, circular motion. Lacquer will dissolve in 30 seconds under gentle, circular rubbing. After you have decided which finish is on your wood furniture, follow the appropriate procedures. Excessive dampness, dryness, heat, or cold can damage wood furniture.
Sunlight can change the color.
Rubber or plastic mats should not be used unless marked safe for wood, since some may soften or stain the finish. Wipe up spills at once to prevent spots that require refinishing. Polish occasionally, not more than 3-4 times a year unless it gets heavy use, with a polish recommended for the kind of finish. Do not mix types of polish. Oil causes wax to become gummy.