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°Oe
The Oechsle scale is a hydrometer scale measuring the density of grape must, which is an indication of grape ripeness and sugar content used in wine-making. It is named for Ferdinand Oechsle (1774–1852) and it is widely used in the German, Swiss and Luxembourgish wine-making industries. On the Oechsle scale, one degree Oechsle (°Oe) corresponds to one gram of the difference between the mass of one litre of must at 20 °C and 1 kg (the mass of 1 litre of water). For example, must with a specific mass of 1084 grams per litre has 84 °Oe. Overview The mass difference between equivalent volumes of must and water is almost entirely due to the dissolved sugar in the must. Since the alcohol in wine is produced by fermentation of the sugar, the Oechsle scale is used to predict the maximal possible alcohol content of the finished wine. This measure is commonly used to select when to harvest grapes. In the vineyard, the must density is usually measured by using a refractomete ...
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German Wine Classification
The German wine classification system puts a strong emphasis on standardization and factual completeness, and was first implemented by the German Wine Law of 1971. Nearly all of Germany's vineyards are delineated and registered as one of approximately 2,600 Einzellagen ('individual sites'), and the produce from any vineyard can be used to make German wine at any quality level, as long as the must weight of the grapes reaches the designated minimum level. As the current German system does not classify vineyards by quality, the measure of wine ’quality’ is the ripeness of the grapes alone. Approximately 200 wine makers have been organised since 1910 in the Verband Deutscher Prädikats- und Qualitätsweingüter (VDP). To counter the shortcomings of the 1971 law, the VDP nowadays classifies the best vineyards by its own rules into 'VDP.Grosse Lage' (Grand cru) and 'VDP.Erste Lage' (Premier cru) based on 19th century Prussian tax maps. Most of these wine makers are based in the re ...
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Eiswein
Ice wine (or icewine; german: Eiswein) is a type of dessert wine produced from grapes that have been frozen while still on the vine. The sugars and other dissolved solids do not freeze, but the water does, allowing for a more concentrated grape juice to develop. The grapes' must is then pressed from the frozen grapes, resulting in a smaller amount of more concentrated, very sweet juice. With ice wines, the freezing happens before the fermentation, not afterwards. Unlike the grapes from which other dessert wines are made, such as Sauternes, Tokaji, or Trockenbeerenauslese, ice wine grapes should not be affected by ''Botrytis cinerea'' or noble rot, at least not to any great degree. Only healthy grapes keep in good shape until the opportunity arises for an ice wine harvest, which in extreme cases can occur after the New Year, on a northern hemisphere calendar. This gives ice wine its characteristic refreshing sweetness balanced by high acidity. When the grapes are free of ''Botry ...
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Kabinett
Kabinett (literal meaning: cabinet), or sometimes Kabinettwein (literal meaning: a wine set aside in a cabinet), is a German language wine term for a wine which is made from fully ripened grapes of the main harvest, typically picked in September, and are usually made in a light style. In the German wine classification system, Kabinett is the lowest level of '' Prädikatswein'', lower in ripeness than Spätlese. In Austria, Kabinett is subcategory of ''Qualitätswein'' rather than a ''Prädikatswein'', and the term always designates a dry wine.Wines from Austria: Quality Designations in Detail
, accessed on May 21, 2008
In the , Kabinet is a category of ...
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Trockenbeerenauslese
''Trockenbeerenauslese'' (literal meaning: 'dried berry selection') is a German language wine term for a medium to full body dessert wine. ''Trockenbeerenauslese'' is the highest in sugar content in the ''Prädikatswein'' category of the Austrian and German wine classifications. ''Trockenbeerenauslese'' wines, often called "TBA" for short, are made from individually selected grapes affected by noble rot (i.e., botrytized grapes). This means that the grapes have been individually picked and are shrivelled with noble rot, often to the point of appearing like a raisin. They are therefore very sweet and have an intensely rich flavour, frequently with a lot of caramel and honey bouquet, stone fruit notes such as apricot, and distinctive aroma of the noble rot. The finest examples are made from the Riesling grape, as this retains plenty of acidity even at the extreme ripeness. Other grape varieties are also used, such as Scheurebe, Ortega, Welschriesling, Chardonnay, and ''Gewürztrami ...
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Must Weight
Must weight is a measure of the amount of sugar in grape juice (must) and, hence, indicates the amount of ethanol, alcohol that could be produced if it is all fermentation (wine), fermented to alcohol, rather than left as residual sugar.Deutsches Weininstitut: Must weights
, accessed on March 26, 2009


Measurement is in degrees

In France and many other countries, the grape must density is often recalculated to show potential alcohol, the percent alcohol content that would be the result if the must were fermented to a completely dry wine, which also applies to fermented water.


Refractometer scales

* Brix (°Bx): Used in Italy, France, and Canada. * Klosterneuburger Mostwaage (KMW): Used in Austria. The scale is divided into Klosterneuburger Zuck ...
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Ferdinand Oechsle
Christian Ferdinand Oechsle (December 26, 1774 – March 17, 1852) was a German mechanical workshop owner, goldsmith and inventor.Gesellschaft für Geschichte des Weines e.V.: Persönlichkeiten der Weinkultur: Oechsle, Christian Ferdinand (1774-1852)
He is most noted for developing a method for measuring the must weight of the grape must in winemaking. The Oechsle scale, named after him and divided into degrees Oechsle (°Oe), is still used for official classification of German wine, Swiss wine and Luxembourg wine.


Biography

Oechsle was born in Buhlbach at Baiersbronn in the northern part of the Black Forest area, the son of Israel Oechsle, a master glass blower, and Christ ...
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Beerenauslese
''Beerenauslese'' (literally: "selection of berries") is a German language wine term for a late harvest wine with noble rot. Beerenauslese is a category in the '' Prädikatswein'' category of the Austrian and German wine classifications, and is a category above Auslese. Beerenauslese wines, often called "BA" for short, are usually made from grapes affected by noble rot, that is "botrytized" grapes. The grapes for ''Beerenauslese'' wines are those that have been individually picked. These wines are typically very sweet and rich, and most age very well. The finest Beerenauslese wines are generally considered to be made from the Riesling grape variety, as this retains significant acidity even with the extreme ripeness, which results in a wine where the sweetness is balanced and which has great longevity and which often will improve for decades. These wines are produced in very small quantities when the weather is suitable for the noble rot to form and only in vineyards with appropri ...
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Auslese
''Auslese'' (literal meaning: "selected harvest"; plural form is ''Auslesen'') is a German language wine term for a late harvest wine and is a riper category than Spätlese in the '' Prädikatswein'' category of the Austrian and German wine classification. The grapes are picked from selected very ripe bunches in the autumn (late November-early December), and have to be hand-picked. Generally Auslese wine can be made in only the best harvest years that have been sufficiently warm. A small proportion of the grapes may be affected by noble rot in some regions although this never dominates the character of the wine. Rheingau winemaker Schloss Johannisberg is generally credited with discovering Auslese wine in 1787. Auslesen are sometimes considered a German dessert wine, especially the wines made from botrytis infected bunches, though it is not as sweet as Eiswein, Beerenauslese (BA), or Trockenbeerenauslese (TBA) dessert wines. Auslesen can be enjoyed by themselves (''aperitif'' â ...
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Spätlese
Spätlese (literal meaning: "late harvest"; plural form is ''Spätlesen'') is a German wine term for a wine from fully ripe grapes, the lightest of the late harvest wines. Spätlese is a riper category than Kabinett in the '' Prädikatswein'' category of the German wine classification and is the lowest level of ''Prädikatswein'' in Austria, where Kabinett is classified in another way.Wines from Austria: Quality Designations in Detail
, accessed on May 19, 2008
In both cases, Spätlese is below in terms of ripeness. The grapes are picked at least seven days after normal har ...
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Hydrometer
A hydrometer or lactometer is an instrument used for measuring density or relative density of liquids based on the concept of buoyancy. They are typically calibrated and graduated with one or more scales such as specific gravity. A hydrometer usually consists of a sealed hollow glass tube with a wider bottom portion for buoyancy, a ballast such as lead or mercury for stability, and a narrow stem with graduations for measuring. The liquid to test is poured into a tall container, often a graduated cylinder, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer correlates to relative density. Hydrometers can contain any number of scales along the stem corresponding to properties correlating to the density. Hydrometers are calibrated for different uses, such as a lactometer for measuring the density (creaminess) of milk, a saccharometer for measuring the density of sugar in a liqu ...
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Fermentation (wine)
The process of fermentation in winemaking turns grape juice into an alcoholic beverage. During fermentation, yeasts transform sugars present in the juice into ethanol and carbon dioxide (as a by-product). In winemaking, the temperature and speed of fermentation are important considerations as well as the levels of oxygen present in the must at the start of the fermentation. The risk of stuck fermentation and the development of several wine faults can also occur during this stage, which can last anywhere from 5 to 14 days for ''primary fermentation'' and potentially another 5 to 10 days for a '' secondary fermentation''. Fermentation may be done in stainless steel tanks, which is common with many white wines like Riesling, in an open wooden vat, inside a wine barrel and inside the wine bottle itself as in the production of many sparkling wines. History The natural occurrence of fermentation means it was probably first observed long ago by humans.H. Johnson: ''Vintage: The Story ...
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Austria
Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous city and state. A landlocked country, Austria is bordered by Germany to the northwest, the Czech Republic to the north, Slovakia to the northeast, Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west. The country occupies an area of and has a population of 9 million. Austria emerged from the remnants of the Eastern and Hungarian March at the end of the first millennium. Originally a margraviate of Bavaria, it developed into a duchy of the Holy Roman Empire in 1156 and was later made an archduchy in 1453. In the 16th century, Vienna began serving as the empire's administrative capital and Austria thus became the heartland of the Habsburg monarchy. After the dissolution of the H ...
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