A gas that is vital for the growth of yeast cells. A small amount of oxygen is important at the start of fermentation. Too high a concentration of oxygen will lead to oxidation of the wine causing a loss of color, flavor, and aroma.
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Wine comes in at the mouth And love comes in at the eye; That's all we shall know for truth Before we grow old and die. I lift the glass to my mouth, I look at you, and sigh.
- William Butler Yeats
