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Gray, soft, heavy metals or Element (Pb = Plumbum), which occurs in nature mostly as galena. It is found in all plants and also in the wine in very small quantities, but has no biological function and is especially dangerous to children as a nerve poison. In ancient Rome, lead was used for sweetening and preserving the wine and fatally be used by Pliny the Elder (23-79) also recommended. In ancient times, cooking wine in lead vessels usual, it was as Defrutum made. Addition of lead acetate or lead oxide to the wine was in Europe until the 17th Century practice, only one recognized the danger. Depending on which any applicable law, the wine was even then a wine adulteration .
It was not until the early 20th Century, was forbidden to use by relevant laws in all countries. The wine is now the use of lead-based Insecticides and also prohibits the use of lead-containing films or Capsule prohibited. It accumulates (like all heavy metals) in soil and can be removed only with great difficulty. Most of the tracks contained in the grapes (eg by exhaust gases from motor vehicles in road in nearby vineyards) is in the fermentation and the fine reduced and then with Lee resigned. The legally permitted maximum limit of lead in wine is 0.3 mg / l, which is however significantly lower than with most wines.