has specified input grape wine maceration carbonic maceration https://en.wikipedia.org/wiki/Carbonic_maceration A maceration process in which whole grapes are fermented in a carbon dioxide rich environment before crushing. Fermentation occurs within grape tissue, rather than from the skin surface. This method involves filling a sealed vessel with carbon dioxide and then adding whole grapes or grape clusters. ... Carbonic maceration ferments most of the juice while it is still inside the grape, although grapes at the bottom of the vessel are crushed by gravity and undergo conventional fermentation."[https://en.wikipedia.org/wiki/Carbonic_maceration]