Inspired by Byzantine architecture, the corridor forms a right angle and consists of eight square compartments, each with a circular dome above and connected by semi-circular arches.

When adopted by The Great Steward of Scotland's Dumfries House Trust, the corridor was presented in a uniform grey colour that had been applied in the 1960s. Historic photographs and an exposed small patch of paintwork showed the original 'Adam revival' design.

In 2010, the careful scraping away of paint in one section confirmed that the original polychrome survived under the grey. This section was then used as a template to restore the rest of the corridor to its former vibrant glory. One of the domed sections revealed has been left unrestored but with its original historical paintwork conserved instead.

The restoration of the polychrome scheme was carried out by Mark Nevin of the firm Nevins of Edinburgh. Mark, a former gold medallist in the World Skills Trade Championship, was twenty-four years old at the time of his involvement. He was assisted by apprentices, some of whom were as young as sixteen, and the works stands as an example of how The Prince's Foundation supports young craftsmen and women, helping to keep valuable skills alive.