Winemaking - Cold and Heat Stabilization

Cold and Heat Stabilization

See also: Clarification and stabilization of wine

Cold stabilization is a process used in winemaking to reduce tartrate crystals (generally potassium bitartrate) in wine. These tartrate crystals look like grains of clear sand, and are also known as "wine crystals" or "wine diamonds". They are formed by the union of tartaric acid and potassium, and may appear to be sediment in the wine, though they are not. During the cold stabilizing process after fermentation, the temperature of the wine is dropped to close to freezing for 1–2 weeks. This will cause the crystals to separate from the wine and stick to the sides of the holding vessel. When the wine is drained from the vessels, the tartrates are left behind. They may also form in wine bottles that have been stored under very cold conditions.

During "heat stabilization", unstable proteins are removed by adsorption onto bentonite, preventing them from precipitating in the bottled wine.

Read more about this topic:  Winemaking

Famous quotes containing the words cold and, cold and/or heat:

    “It is better to have the power of self-protection than to depend on any man, whether he be the Governor in his chair of State, or the hunted outlaw wandering through the night, hungry and cold and with murder in his heart.”
    —Lillie Devereux Blake (1835–1913)

    “I have been told, that in some public discourses of mine my reverence for the intellect has made me unjustly cold to the personal relations. But now I almost shrink at the remembrance of such disparaging words. For persons are love’s world, and the coldest philosopher cannot recount the debt of the young soul wandering here in nature to the power of love, without being tempted to unsay, as treasonable to nature, aught derogatory to the social instincts.”
    —Ralph Waldo Emerson (1803–1882)

    “Why does man freeze to death trying to reach the North Pole? Why does man drive himself to suffer the steam and heat of the Amazon? Why does he stagger his mind with the mathematics of the sky? Once the question mark has arisen in the human brain the answer must be found, if it takes a hundred years. A thousand years.”
    —Walter Reisch (1903–1963)