All foods must be labeled as to the ingredients in them, , but we have a list of things which are called “processing aids” which don’t have to be listed, for example peroxide can be used in Australian wines.
Ive always wanted to know... do professional wineries add other ingredients to create their unique wines or are all the wines we buy in stores only from grapes?
* The US label regulations are cumbersome, every recipe needs to have an approved label. There is some wiggle room on alcohol content which takes into consideration annual crop variation. Lab testing has to be done to prove the percentage alcohol. The percentage alcohol determines which tax bracket the product falls in, , , , is it wine or a 7.9% (or less) alcoholic drink or a high alcohol port?
* a label with a named varietal grape has to contain that grape, a fanciful name ex “best tasting red grape” can be what ever red grape the winery makes it, and it can not contain other fruit. Estate grown indicates that it is primarily produced in that vineyard, local regulations vary as far as if this has to be 100%. The term wine without any other modifier names means grapes.
* many wines exist where the labeled ingredient is a “fruit” wine. If so labeled it must contain said fruit and not others. If the label is incorrect the product is typically destroyed or relabeled with corrections after which it is likely to wind up in a secondary market.
* there are significant variations country to country on what ingredients are permitted as processing aids
* a winery which has a label containing grape and another fruit (flavor) sometimes does not actually have the secondary fruit in the winery. High quality extracts exist in industrial quantity that can be added prior to bottling, much the same as adding an F pack. If you see WONF it means with other natural flavor, not necessarily a fruit concentrate.