It's a Grey Day (S02E12)

S02E01 The Mixing Factory S02E02 A Plate of Many Colours S02E03 Name That Colour S02E04 Colouring a Rainbow S02E05 Printing Crew to the Rescue S02E06 Deep Blue and Sky Blue S02E07 Oranges Gym S02E08 Purple's Mural Makeover S02E09 Lime S02E10 Return of the Sorting Express S02E11 Fun with Colours S02E12 It's a Grey Day S02E13 Red's Recolouring Tour S02E14 A Colourful Journey