The event coincides with the International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade and some of the participating students are travelling on a replica of the Amistad which is retracing the Slave Trade Route.

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In the 18th century, it was home to one of the largest population of free blacks in the New World even as it became one of the centers of the global slave trade and home to some of its most violent abuses.

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The ranks of the aggrieved are likely to continue swelling for some time: of the estimated 7.6m wartime slave labourers, the World Jewish Congress reckons that some 500, 000 are still alive.

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However, she added that the role some Scots played in the slave trade during a "shameful period" should also be acknowledged.

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There was also no sign on Tuesday of an accord on another issue at the conference -- African demands that former slave states make a formal apology for some 400 years of human trafficking up to the early 19th century, during which some 12 million people where shipped in chains to the Americas.

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Nullification is to be opposed because some of its defenders were also slave owners and slavery apologists.

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Some of the earliest works, like those of Joshua Johnston, a freed slave born in 1765, depict white subjects almost exclusively.

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