This also generally considered Alterston or dialectically "Altl" designated typical taste and odor especially occurs with older white wines. The name derives from the Old High German "firni" for "previous year" or "old". This most common type of Alterstons but not allowed UTA (atypical age sound), sulfurous off (Lagerböckser) or the related petrol tone be confused. The cause of old age pimples is first and foremost oxidation by atmospheric oxygen, This is done by too high oxygen uptake after filtration, as well as high temperatures during storage, reinforced by high content of flavonoids phenols in the wine. This is also promoted by defective corks (closures). Firewood can be produced in oak barrels after one and a half years, but bottle storage usually takes much longer.
The fires emerge through Karamellisierungs reactions between amino acids (Proteins) and Sugar, The typical bitter taste is expressed by the smell and taste of black tea, old straw, honey, resin, nuts, mushrooms and damp soil. The responsible substances are higher aldehydes (Alcohol compounds). The sound can increase up to an unpleasant camphor-like (after the tree) impression. Due to the oxidation it comes to color changes up to Hochfärbigkeit, Lovers of older white wines tolerate the age-old to a small extent and even describe them positively as "noble-minded". To a greater extent, it is at least one wine faults, Other causes has the Schwefelsäurefirn,