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The Restoration of the Last Supper, the Church and Dominican Convent of Santa Maria delle Grazie.

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The convent of Santa Maria delle Grazie in Milan in northern Italy is known the world over for one painting.

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The Last Supper is a masterpiece. It was painted by Leonardo da Vinci 500 years ago.

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A major effort to restore it to its original form began in 1979. The project took over 20 years to complete.

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The image on the left is before restoration. The image on the right is after.

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Restorers during their work learnt how Leonardo da Vinci applied the law of perspective to the painting.

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A hole for a nail was discovered around Jesus' temple as they removed paint from previous restoration efforts.

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It served as the centre of perspective, a technique first applied by da Vinci.

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The artist structured his painting to perfection by drawing pieces of string from the centre.

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Jesus is at the centre of the perspective, indicating that he is the centre of the story being depicted.

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Jesus' lips were thought to have been closed, but after restoration it was discovered that they were slightly parted.

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One of you is about to betray me.

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There is a tension, a stir and whispering among the disciples. It's as if the dramatic moment is captured in slow motion.

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Judas, who betrayed Jesus for 30 pieces of silver, was found to have been holding a bag of money in his hand.

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The Last Supper is the work of a genius, capturing a dramatic and chilling moment.

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Though long hidden, that moment is now there for all to see.