PRECAUTIONS: Handle silverware and PVD items as indicated for stainless steel items. Never use any type of scraper or steel wool, which would permanently damage the silver and PVD surfaces. Silver can sulphurate due to exposition to air, becoming dark in a more or less uniform way. This can happen also as a consequence of the contact with some foods. It is a natural process which does not damage the silver deposit but alters its look. The silver coat must be polished in order to restore the original state with good silver polishing products. Please make sure these products have to be diluted in warm water only.