Wine has its origins in the 19th century, when Louis Pasteur scientists found that people of the world, "yeast" or small molds. A change in fruit sugar into alcohol. By reaction with relatively complex Fermentation of grape juice into wine is a wine that is natural. The yeast that exists naturally in the skin of grapes into alcohol and carbon dioxide bubbles. This may add yeast to it. The fermentation process Red wine made from red grapes. The fermentation temperature for about two weeks with a temperature of 21-29 degrees Celsius, the white wine made from white grapes. Fermentation at a temperature of 10-15 C for approximately 3-6 weeks.