Maderisation is a process that involves the heating and
oxidisation
Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...
of a wine. The term is named after the process used in the production of
Madeira wine
Madeira is a fortified wine made on the Portuguese Madeira Islands, off the coast of Africa. Madeira is produced in a variety of styles ranging from dry wines which can be consumed on their own, as an apéritif, to sweet wines usually consu ...
, where it occurs while the wine is in
cask
A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is wide. They are traditionally made of wooden staves and bound by wooden or metal hoops. The word vat is often used for large containers for liquids, u ...
. The resulting wine darkens in color and acquires a
Sherry
Sherry ( es, jerez ) is a fortified wine made from white grapes that are grown near the city of Jerez de la Frontera in Andalusia, Spain. Sherry is produced in a variety of styles made primarily from the Palomino grape, ranging from light versi ...
-like character. Outside Madeira wine, it is generally seen as a
wine fault
A wine fault or defect is an unpleasant characteristic of a wine often resulting from poor winemaking practices or storage conditions, and leading to wine spoilage. Many of the compounds that cause wine faults are already naturally present in wine ...
, but is desirable in the case of certain
dessert wine
Dessert wines, sometimes called pudding wines in the United Kingdom, are sweet wines typically served with dessert.
There is no simple definition of a dessert wine. In the UK, a dessert wine is considered to be any sweet wine drunk with a meal ...
s where it occurs over the course of long bottle
aging
Ageing ( BE) or aging ( AE) is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In ...
.
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Madeira wine