To the big group of flavonoids
(Plant dyes) counting Phenol compound
(Polyphenol) as sugar bound glycoside
, The yellow dye, also known as Quercitin or Querzetin, is found especially in the bark of the American dyeing areas (Quercus tinctoria), as well as in apples, broccoli and onions. In the grapes it is the most common, flavonoid dye. It is formed especially in sunlight. In a barrel removal, Quercetin also changes from wood to wine. The substance has an antioxidant effect and also has a radical scavenger health benefits
, positive effect.