A survey by the world's biggest wine competition has added a new twist to the debate on corks and screw-caps. Tasters at this year's International Wine Challenge discovered that though cork taint is on the decline, the problems affecting wines sealed with screw-caps have probably been underestimated, reports The Daily Telegraph of London.

From a blind tasting of more than 9,000 wines they found out that 4.4% of the corked wine had been tainted in some way, but 2.2% of the screwcapped wine had also been damaged. Faults caused by screwcaps are mainly a build-up of sulphides, which give wine a flavour of rotten eggs or reeking onions.

For the complete story, go to http://www.telegraph.co.uk