Murano glass is glass in a chemical sense of the word. However, Murano glass is as different from, say, the glass in your window panes, as Rembrandt paintings are different from an empty canvas. Murano glass is created only on the island of Murano, located within the borders of the city of Venice in Northern Italy. This glass is made from silica, soda, lime and potassium melted together in a special furnace at a temperature of 1500 degrees Celsius to reach a liquid state. Gold or silver foil are often added to the glass mixture, along with such minerals as copper for sparkles, zinc for white color, cobalt for blue, manganese for violet, and so on. The mixture is then mouth-blown and/or hand-crafted by master glassmakers using special techniques and basic tools, many of which have been developed in the Middle Ages and changed little since then. This method of glass-making results in unique creations with rich coloring and beautiful, sometimes surreal, patterns and shapes, deserving to be called "works of art". Even though beautiful glassware has also been created in other places around the world, none of the glassware still being produced has such rich history and so much artistic value as Murano glass.