The hoard was found by father and son David and Andrew Whelan while metal detecting near Harrogate in 2007. David described the find as a "ball covered with mud". Picture: British Museum Trustees.
The vessel containing most of the hoard at first appeared "uniformly grey", said conservators. Picture: British Museum Trustees.
After cleaning, the vessel was revealed to be silver-gilt decorated with alternate deer and lions and inlaid with black niello. Picture: British Museum Trustees.
Conservator Fleur Shearman working on the Vale of York Hoard vessel. Photo: British Museum trustees.
Some 100 of the 617 coins in the hoard have now been cleaned. Conservators are delighted with their condition. Picture: British Museum Trustees.
The treasure included jewellery, silver ingots and "hack silver" - items cut up for their bullion vale. Picture: British Museum Trustees.
From the hoard: gold Viking arm ring; cut-up brooch of Irish design; dirham from Samarkand, Uzbekistan; coin calling Athelstan King of All Britain. Pictures: British Museum Trustees.