Taking care of your veneer furniture:
A wood veneer is a very thin sheet of wood that is glued onto another piece of wood. Furniture made with veneer has properties that make it different from solid wood, and proper maintenance will keep it looking its best. 
The first thing you can do is to use placemats or a tablecloth every day to protect your veneer tabletop from spills and water rings. It also prevents damage from steam that can build up under hot plates and serving bowls. Heat can loosen the glue that attaches the veneer to the wood underneath it. Also, place trivets under your hot serving pieces to keep the heat away from the table’s surface, preventing blistering. Along the same lines, make sure you use coasters under your glasses to avoid leaving water rings. The moisture can soak into the wood and change its opacity, leaving the white mark.
When anything is spilled, be sure to wipe it up right away, again because liquid will soak into the wood and weaken the glue underneath it.
Using a clean cloth and furniture polish to clean wood veneers keeps the dust and dirt from building up. Keeping it clean can help minimize tiny scratches and small chips that can degrade the finish after a while.
Whether you have a valuable antique piece of furniture or favorite garage sale treasure, caring for your walnut veneer can keep it looking beautiful.