(This is also done with various flavor essences from the juice, so they can recombine them in such a way as to produce a uniform flavor all throughout the year regardless of where the fruits are coming from.)
> It should be clearly indicated when a product is a mixture of fruit juice and fruit juice from concentrate
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex%3A...
Not perfect but at least you can’t just say it’s fruit juice.
> 4. For fruit juices which have been sweetened by the addition of sugars, the sales name shall include the word "sweetened" or "with added sugar", followed by an indication of the maximum quantity of sugar added, calculated as dry matter and expressed in grams per litre. [1]
> A claim stating that sugars have not been added to a food, and any claim likely to have the same meaning for the consumer, may only be made where the product does not contain any added mono- or disaccharides or any other food used for its sweetening properties. [2]
Coming from a country of impenetrable legalese everywhere, I find these regulations very refreshing, they are incredibly easy to read and always straight to the point.
[1] https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex%3A...
[2] https://ec.europa.eu/commission/presscorner/detail/en/memo_0...