The Fermentation Process in Wine Making Wine making is a long process. After the best grapes have been harvested and pressed they have to go through a process called fermentation. During pressing, when the grapes' skins are broken, yeast, or Saccharomyees ellipsoideus, from the skins comes in contact with the sugar from the insides of the grapes. The yeast enzymes convert the sugar into alcohol and carbon dioxide. They also make various by-products that may …showed first 75 words of 251 total…

…showed last 75 words of 251 total…the bottles and this then produces the bubbles. Fermentation gives off heat, so most wineries refrigerate the must so the temperature stays constant throughout the process. White wines are usually kept at about 59ºF, and red wines are kept at around 86ºF. The higher temperature in the red wine allows the color and flavor of the skins to transfer to the wine. Yeast isn't only used in wine making. It is a very useful fungus.