(Decanter) - Italian authorities have approved the use of synthetic corks and screwcaps on higher quality DOC and DOCG wines for the first time. The move opens a new front in the highly-charged wine industry debate on closures. Synthetic cork producer Nomacorc is already plotting ways to dent the dominance of natural corks in DOC and DOCG wines. 'We've effectively been blocked from 30% of the market, so it's huge,' Nomacorc's CEO, Lars von Kantzow, told Decanter.com.