The new work was begun during a conservation treatment in 2009, when conservators found that the yellows in Flowers In A BlueVase - this time from a pigment called cadmium yellow - had turned greyish and cracked.
To add the layer of grayish blue that distinguishes some of the more furtive lines in "The Sisters, " I tucked in some icy blue tweedia and chose a chalky gray vase.
And with the FA Cup final between Chelsea and Portsmouth to be played at the venue on 15 May - as well as three Football League play-off finals, the Blue Square Premier play-off final, FA Trophy and FA Vase finals and England's World Cup warm-up match against Mexico during the month - Wembley Stadium announced on Sunday that work had begun on a new surface.